### Setup and Build on Linux

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Installs dependencies, sets up the Rust environment, and builds the project from source.

```sh
# Install basic stuff
sudo apt update
sudo apt install curl git build-essential pkg-config libssl-dev liblzma-dev llvm-dev libclang-dev clang -y

# Install Rust
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh # choose 1 (default)
source $HOME/.cargo/env
# Using nightly is not necessary if you want to build just the low-level, medium-level or high-level API!
rustup default stable-x86_64-unknown-linux-gnu

# Clone reaper-rs
cd Downloads
git clone --recurse-submodules https://github.com/helgoboss/reaper-rs.git
cd reaper-rs

# Build reaper-rs
cargo build
```

--------------------------------

### Install Rust on macOS

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Downloads and installs the Rust toolchain via rustup.

```sh
# Install Rust
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh # choose 1 (default)
source $HOME/.cargo/env
```

--------------------------------

### Reactive Extensions Example

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Shows how to use reactive extensions (`reaper-rx`) with rxRust to subscribe to events, such as track removal notifications.

```rust
rx.track_removed().subscribe(|t| println!("Track {{:?}} removed", t));
```

--------------------------------

### Low-Level API Example

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Demonstrates basic operations using the raw, unsafe low-level REAPER API. Use with caution as it bypasses type safety.

```rust
unsafe {
    reaper.ShowConsoleMsg(c"Hello world from reaper-rs low-level API!");
    let track = reaper.GetTrack(null_mut(), 0);
    reaper.DeleteTrack(track);
}
```

--------------------------------

### High-Level API Example

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Illustrates usage of the high-level API, which employs object-oriented paradigms for a safer and more intuitive experience without `unsafe` blocks.

```rust
reaper.show_console_msg("Hello world from reaper-rs high-level API!");
let project = reaper.current_project();
let track = project.track_by_index(0).ok_or("no tracks")?;
project.remove_track(&track);
```

--------------------------------

### Clone and Build reaper-rs

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Clone the reaper-rs repository and build the project using Cargo. Ensure you have the stable Rust toolchain installed.

```bash
rustup default stable-x86_64-apple-darwin

cd Downloads
git clone --recurse-submodules https://github.com/helgoboss/reaper-rs.git
cd reaper-rs

cargo build
```

--------------------------------

### Implement REAPER Audio Hook

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Implement the `OnAudioBuffer` trait for real-time audio processing. This hook runs in the real-time audio thread, so avoid allocations, blocking, or locks. This example logs every 100 callbacks and reads MIDI input.

```rust
use reaper_medium::{
    ReaperSession, OnAudioBuffer, OnAudioBufferArgs,
    Reaper, RealTimeAudioThreadScope, MidiInputDeviceId
};

struct MyAudioHook {
    counter: u64,
    reaper: Reaper<RealTimeAudioThreadScope>,
}

impl OnAudioBuffer for MyAudioHook {
    fn call(&mut self, args: OnAudioBufferArgs) {
        // This runs in the real-time audio thread!
        // Be careful: no allocations, no blocking, no locks

        self.counter += 1;

        // Log every 100 callbacks (not recommended in production)
        if self.counter % 100 == 0 {
            // Access audio buffer info
            let sample_rate = args.reg.sample_rate();
            let num_samples = args.reg.nch();
        }

        // Read MIDI input from device 0
        self.reaper.get_midi_input(MidiInputDeviceId::new(0), |input| -> Option<()> {
            let input = input?;
            for event in input.get_read_buf().enum_items(0) {
                // Process MIDI event
                println!("MIDI: {:?}", event);
            }
            Some(())
        });
    }
}

fn register_audio_hook(session: &mut ReaperSession) {
    let rt_reaper = session.create_real_time_reaper();
    let hook = Box::new(MyAudioHook {
        counter: 0,
        reaper: rt_reaper,
    });

    let handle = session.audio_reg_hardware_hook_add(hook)
        .expect("Failed to register audio hook");
    // Store handle to unregister later
}
```

--------------------------------

### Implement REAPER Custom Command

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Implement the `HookCommand` trait to handle custom actions triggered by REAPER. This example defines a simple command handler that prints a message when executed.

```rust
use reaper_medium::{
    ReaperSession, HookCommand, CommandId, OwnedGaccelRegister,
    Accel, AccelMsg
};

// Define command handler
struct MyHookCommand;

impl HookCommand for MyHookCommand {
    fn call(command_id: CommandId, flag: i32) -> bool {
        // Return true if you handled this command
        println!("Command {} executed with flag {}", command_id.get(), flag);
        true
    }
}

fn register_action(session: &mut ReaperSession) {
    // Register a unique command ID
    let command_id = session.plugin_register_add_command_id("MY_CUSTOM_ACTION")
        .expect("Failed to register command ID");

    // Create keyboard shortcut (Ctrl+Shift+A)
    let accel = Accel::new(
        AccelMsg::new().with_control(true).with_shift(true),
        65  // 'A' key
    );

    // Register the action with description
    let register = OwnedGaccelRegister::new(accel, command_id, "My Custom Action");
    session.plugin_register_add_gaccel(register)
        .expect("Failed to register action");

    // Register the hook command to handle execution
    session.plugin_register_add_hook_command::<MyHookCommand>()
        .expect("Failed to register hook command");
}
```

--------------------------------

### Implement REAPER Control Surface

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Implement the `ControlSurface` trait to receive REAPER state changes. Callbacks are provided for track and transport events. This example shows basic logging for volume and playback state changes.

```rust
use reaper_medium::{
    ControlSurface, ReaperSession,
    SetSurfaceVolumeArgs, SetPlayStateArgs,
    SetTrackTitleArgs, MediaTrack
};

#[derive(Debug)]
struct MyControlSurface {
    track_count: u32,
}

impl ControlSurface for MyControlSurface {
    // Called approximately 30 times per second
    fn run(&mut self) {
        // Perform periodic tasks here
    }

    // Called when track list changes
    fn set_track_list_change(&self) {
        println!("Track list changed!");
    }

    // Called when track volume changes
    fn set_surface_volume(&self, args: SetSurfaceVolumeArgs) {
        println!("Track volume changed to: {:?}", args.volume);
    }

    // Called when transport state changes (play/pause/record)
    fn set_play_state(&self, args: SetPlayStateArgs) {
        if args.is_playing {
            println!("Playback started");
        } else if args.is_paused {
            println!("Playback paused");
        } else {
            println!("Playback stopped");
        }
    }

    // Called when track name changes
    fn set_track_title(&self, args: SetTrackTitleArgs) {
        println!("Track renamed");
    }
}

fn register_control_surface(session: &mut ReaperSession) {
    let surface = Box::new(MyControlSurface { track_count: 0 });
    let handle = session.plugin_register_add_csurf_inst(surface)
        .expect("Failed to register control surface");
    // Keep handle to unregister later if needed
}
```

--------------------------------

### Medium-Level API Control Surface Registration

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Example of registering a custom control surface implementation with the REAPER session using the medium-level API. Requires implementing the `ControlSurface` trait.

```rust
struct MyControlSurface;

impl ControlSurface for MyControlSurface {
    fn set_track_list_change(&self) {
        println!("Tracks changed");
    }
}

session.plugin_register_add_csurf_inst(MyControlSurface);
```

--------------------------------

### Clone Repository and Build on Windows

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Downloads the project source and compiles it using Cargo.

```batch
git clone --recurse-submodules https://github.com/helgoboss/reaper-rs.git
cd reaper-rs
cargo build
```

--------------------------------

### Initialize ReaperSession and access API

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Demonstrates creating a session from the plugin context and accessing core REAPER functions like console messaging and project information.

```rust
use reaper_medium::{ReaperSession, ProjectContext::CurrentProject};
use reaper_low::PluginContext;

fn initialize_session(context: PluginContext) {
    // Create a new session from plug-in context
    let session = ReaperSession::load(context);

    // Access REAPER functions through the Reaper instance
    let reaper = session.reaper();

    // Print to REAPER console
    reaper.show_console_msg("Session initialized!\n");

    // Get track count in current project
    let track_count = reaper.count_tracks(CurrentProject);
    reaper.show_console_msg(format!("Project has {} tracks\n", track_count));

    // Get app version info
    let version = reaper.get_app_version();
    reaper.show_console_msg(format!("REAPER version: {}\n", version));
}
```

--------------------------------

### Implement REAPER Extension Entry Point

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Basic implementation of a REAPER extension using the reaper_extension_plugin macro.

```rust
use std::error::Error;
use reaper_macros::reaper_extension_plugin;
use reaper_low::PluginContext;
use reaper_medium::ReaperSession;

#[reaper_extension_plugin]
fn plugin_main(context: PluginContext) -> Result<(), Box<dyn Error>> {
    let session = ReaperSession::load(context);
    session.reaper().show_console_msg("Hello world from reaper-rs medium-level API!");
    Ok(())
}
```

--------------------------------

### Bootstrap a REAPER extension plugin

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Uses the reaper_extension_plugin macro to generate the required entry point and handle DLL initialization.

```rust
use std::error::Error;
use reaper_macros::reaper_extension_plugin;
use reaper_low::PluginContext;
use reaper_medium::ReaperSession;

#[reaper_extension_plugin]
fn plugin_main(context: PluginContext) -> Result<(), Box<dyn Error>> {
    let session = ReaperSession::load(context);
    session.reaper().show_console_msg("Hello world from reaper-rs!");
    Ok(())
}
```

--------------------------------

### Create a REAPER-aware VST Plugin

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Initializes a VST plugin that attempts to access the REAPER context when loaded within the host. Requires the reaper-low and reaper-medium crates.

```rust
use vst::plugin::{Info, Plugin, HostCallback};
use reaper_low::{PluginContext, reaper_vst_plugin, static_plugin_context};
use reaper_medium::ReaperSession;

reaper_vst_plugin!();

#[derive(Default)]
struct MyReaperVstPlugin {
    host: HostCallback,
    session: Option<ReaperSession>,
}

impl Plugin for MyReaperVstPlugin {
    fn new(host: HostCallback) -> Self {
        Self { host, session: None }
    }

    fn get_info(&self) -> Info {
        Info {
            name: "My REAPER VST".to_string(),
            unique_id: 12345,
            inputs: 2,
            outputs: 2,
            ..Default::default()
        }
    }

    fn init(&mut self) {
        // Try to get REAPER context (only works when loaded in REAPER)
        if let Ok(context) = PluginContext::from_vst_plugin(&self.host, static_plugin_context()) {
            let session = ReaperSession::load(context);
            session.reaper().show_console_msg("VST plugin loaded in REAPER!\n");
            self.session = Some(session);
        }
    }
}

vst::plugin_main!(MyReaperVstPlugin);
```

--------------------------------

### Perform REAPER project operations

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Demonstrates how to iterate through open project tabs, validate project pointers, open files, and track state changes.

```rust
use reaper_medium::{Reaper, ProjectRef, ProjectContext, MainThreadScope};

fn project_operations(reaper: &Reaper<MainThreadScope>) {
    // Enumerate all open project tabs
    for i in 0.. {
        match reaper.enum_projects(ProjectRef::Tab(i), 256) {
            Some(result) => {
                println!("Project {}: {:?}", i, result.file_path);
            }
            None => break, // No more projects
        }
    }

    // Get current project
    let current = reaper.enum_projects(ProjectRef::Current, 0)
        .expect("No current project");

    // Check if a project pointer is still valid
    let is_valid = reaper.validate_ptr_2(
        ProjectContext::CurrentProject,
        current.project
    );

    // Open a project file
    reaper.main_open_project(
        camino::Utf8Path::new("/path/to/project.rpp"),
        reaper_medium::OpenProjectBehavior {
            open_as_template: false,
            prompt: true,
        }
    );

    // Get project state change count (useful for detecting changes)
    let state_count = reaper.get_project_state_change_count(ProjectContext::CurrentProject);
}
```

--------------------------------

### Build Docker Image for reaper-low

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Build a Docker image containing Rust, LLVM, and Clang, necessary for regenerating the low-level API.

```docker
# Build image (official Rust image + LLVM and Clang)
docker build --tag rust-for-reaper-rs .
```

--------------------------------

### Configure Cargo.toml for REAPER Extension

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Required dependencies and crate configuration for a REAPER extension plug-in.

```toml
[dependencies]
reaper-medium = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
reaper-low = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
reaper-macros = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }

[lib]
name = "reaper_my_extension"
crate-type = ["cdylib"]
```

--------------------------------

### Set Default Rust Toolchain on Windows

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Configures the stable MSVC toolchain for Windows development.

```batch
rustup default stable-x86_64-pc-windows-msvc
```

--------------------------------

### Interact with Projects and Tracks via High-Level API

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Demonstrates object-oriented access to projects, tracks, FX chains, and track properties. Uses the reaper-high crate for simplified management.

```rust
use reaper_high::{Reaper, Project, Track};

fn high_level_example() {
    let reaper = Reaper::get();

    // Get current project
    let project = reaper.current_project();

    // Iterate tracks
    for track in project.tracks() {
        if let Some(name) = track.name() {
            println!("Track: {}", name.to_str());
        }

        // Get FX chain
        let fx_chain = track.normal_fx_chain();
        for fx in fx_chain.fxs() {
            println!("  FX: {}", fx.name().to_str());
        }
    }

    // Get track by index
    if let Some(track) = project.track_by_index(0) {
        // Set track name
        track.set_name("Lead Vocal");

        // Set track color
        track.set_custom_color(Some(reaper_medium::RgbColor::new(255, 0, 0)));

        // Add item to track
        if let Ok(item) = track.add_item() {
            println!("Added new item to track");
        }
    }

    // Get selected tracks
    for track in project.selected_tracks(reaper_medium::MasterTrackBehavior::ExcludeMasterTrack) {
        println!("Selected: {:?}", track.name());
    }
}
```

--------------------------------

### Link Test Plugins on Linux

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Creates symbolic links to make compiled test plugins available to the REAPER application.

```sh
mkdir -p $HOME/.config/REAPER/UserPlugins/FX
ln -s $HOME/Downloads/reaper-rs/target/debug/libreaper_test_extension_plugin.so $HOME/.config/REAPER/UserPlugins/reaper_test_extension_plugin.so
ln -s $HOME/Downloads/reaper-rs/target/debug/libreaper_test_vst_plugin.so $HOME/.config/REAPER/UserPlugins/FX/reaper_test_vst_plugin.so
```

--------------------------------

### Medium-Level API Basics

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Shows fundamental usage of the medium-level API, which provides type-safe bindings to the original REAPER C++ API. This is the recommended API for general use.

```rust
reaper.show_console_msg("Hello world from reaper-rs medium-level API!");
let track = reaper.get_track(CurrentProject, 0).ok_or("no tracks")?;
unsafe { reaper.delete_track(track); }
```

--------------------------------

### Regenerate reaper-low API with Docker

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Run a Docker container to build the reaper-low package with the 'generate' feature. This ensures deterministic results for API regeneration.

```docker
# Build reaper-low with feature "generate"
docker run --rm --user "$(id -u)":"$(id -g)" -v "$PWD":/usr/src/myapp -w /usr/src/myapp rust-for-reaper-rs cargo build --package reaper-low --features generate
```

--------------------------------

### REAPER VST Plug-in Implementation in Rust

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

This Rust code implements a basic REAPER VST plug-in. It uses the `vst-rs` crate for the VST structure and `reaper-rs` to interact with the REAPER API, specifically showing a console message on initialization.

```rust
use vst::plugin::{Info, Plugin, HostCallback};
use reaper_low::{PluginContext, reaper_vst_plugin, static_plugin_context};
use reaper_medium::ReaperSession;

reaper_vst_plugin!();

#[derive(Default)]
struct MyReaperVstPlugin {
    host: HostCallback,
}

impl Plugin for MyReaperVstPlugin {
    fn new(host: HostCallback) -> Self {
        Self { host }
    }

    fn get_info(&self) -> Info {
        Info {
            name: "My REAPER VST plug-in".to_string(),
            unique_id: 6830,
            ..Default::default()
        }
    }

    fn init(&mut self) {
        if let Ok(context) = PluginContext::from_vst_plugin(&self.host, static_plugin_context()) {
            let session = ReaperSession::load(context);
            session
                .reaper()
                .show_console_msg("Hello world from reaper-rs medium-level API!");
        }
    }
}

vst::plugin_main!(MyReaperVstPlugin);
```

--------------------------------

### Format Code with Cargo

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Format the project's code using Cargo's built-in formatting tool.

```bash
cargo fmt
```

--------------------------------

### Process MIDI Input and Output

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Accesses MIDI devices to read and write messages within the real-time audio thread. Uses RealTimeAudioThreadScope for thread safety.

```rust
use reaper_medium::{
    Reaper, RealTimeAudioThreadScope, MidiInputDeviceId, MidiOutputDeviceId
};

fn process_midi(reaper: &Reaper<RealTimeAudioThreadScope>) {
    // Read from MIDI input device
    reaper.get_midi_input(MidiInputDeviceId::new(0), |input| -> Option<()> {
        let input = input?;
        let read_buf = input.get_read_buf();

        for event in read_buf.enum_items(0) {
            let msg = event.message();
            // Process MIDI message
            // msg contains status byte, data1, data2
        }
        Some(())
    });

    // Write to MIDI output
    reaper.get_midi_output(MidiOutputDeviceId::new(0), |output| -> Option<()> {
        let output = output?;
        // Send MIDI note on: channel 0, note 60, velocity 100
        output.send_msg(&[0x90, 60, 100], -1);
        Some(())
    });
}
```

--------------------------------

### Regenerate Low-level API on Linux

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Triggers the generation of low-level API bindings using the specified feature flag.

```sh
cd main/low
cargo build --features generate
cargo fmt
```

--------------------------------

### Cargo.toml Dependencies for REAPER VST Plug-in

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Add these dependencies to your Cargo.toml file to build a REAPER VST plug-in. This includes the necessary reaper-rs crates and the vst crate.

```toml
[dependencies]
reaper-medium = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
reaper-low = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
vst = "0.2.0"

[lib]
name = "my_reaper_vst_plugin"
crate-type = ["cdylib"]
```

--------------------------------

### Subscribe to REAPER Events with Reactive Extensions

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Uses rxRust to handle state changes such as track modifications, volume adjustments, and transport status. Requires the reaper-rx crate.

```rust
use reaper_rx::ControlSurfaceRx;
use rxrust::prelude::*;

fn setup_reactive_handlers(rx: &ControlSurfaceRx) {
    // Subscribe to track added events
    rx.track_added().subscribe(|track| {
        println!("Track added: {:?}", track.name());
    });

    // Subscribe to track removed events
    rx.track_removed().subscribe(|track| {
        println!("Track removed: {:?}", track.guid());
    });

    // Subscribe to volume changes
    rx.track_volume_changed().subscribe(|track| {
        println!("Volume changed on track");
    });

    // Subscribe to FX parameter changes
    rx.fx_parameter_value_changed().subscribe(|param| {
        println!("FX parameter changed");
    });

    // Subscribe to play state changes
    rx.play_state_changed().subscribe(|_| {
        println!("Transport state changed");
    });

    // Subscribe to project switches
    rx.project_switched().subscribe(|project| {
        println!("Switched to project");
    });
}
```

--------------------------------

### Manipulate tracks using medium-level API

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Shows how to retrieve, inspect, and modify track properties such as names, volume, and mute state, as well as inserting new tracks.

```rust
use reaper_medium::{Reaper, ProjectContext::CurrentProject, MainThreadScope};

fn manipulate_tracks(reaper: &Reaper<MainThreadScope>) {
    // Get track by index (0-based)
    if let Some(track) = reaper.get_track(CurrentProject, 0) {
        // Get track name (with closure for safe string access)
        reaper.get_set_media_track_info_get_name(track, |name| {
            println!("First track name: {}", name.to_str());
        });

        // Get track volume
        let volume = unsafe {
            reaper.get_media_track_info_value(track, reaper_medium::TrackAttributeKey::Vol)
        };
        println!("Track volume: {}", volume);

        // Set track mute state
        unsafe {
            reaper.set_media_track_info_value(
                track,
                reaper_medium::TrackAttributeKey::Mute,
                1.0  // 1.0 = muted, 0.0 = unmuted
            ).expect("Failed to set mute");
        }
    }

    // Insert a new track at index 0
    reaper.insert_track_at_index(0, reaper_medium::TrackDefaultsBehavior::OmitDefaultEnvAndFx);

    // Count total tracks
    let total = reaper.count_tracks(CurrentProject);
    reaper.show_console_msg(format!("Total tracks: {}\n", total));
}
```

--------------------------------

### Add reaper-rs Dependencies to Cargo.toml

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Include these lines in your Cargo.toml file to add reaper-rs as a dependency. It is recommended to use the git repository for the latest changes.

```toml
reaper-medium = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
reaper-low = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
reaper-macros = { git = "https://github.com/helgoboss/reaper-rs.git", branch = "master" }
```

--------------------------------

### Medium-Level API Audio Hook Registration

Source: https://github.com/helgoboss/reaper-rs/blob/master/README.md

Demonstrates how to register a custom audio processing hook using the medium-level API. The `OnAudioBuffer` trait must be implemented for the hook.

```rust
struct MyOnAudioBuffer {
    counter: u64
}

impl OnAudioBuffer for MyOnAudioBuffer {
    fn call(&mut self, args: OnAudioBufferArgs) {
        if self.counter % 100 == 0 {
            println!("Audio hook callback counter: {{}}\n", self.counter);
        }
        self.counter += 1;
    }
}

session.audio_reg_hardware_hook_add(MyOnAudioBuffer { counter: 0 });
```

--------------------------------

### Register REAPER Custom Action

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Registers a custom command ID, associates it with a keyboard shortcut, and hooks the command execution. This allows custom actions to be triggered within REAPER.

```rust
fn register_action(session: &mut ReaperSession) {
    // Register a unique command ID
    let command_id = session.plugin_register_add_command_id("MY_CUSTOM_ACTION")
        .expect("Failed to register command ID");

    // Create keyboard shortcut (Ctrl+Shift+A)
    let accel = Accel::new(
        AccelMsg::new().with_control(true).with_shift(true),
        65  // 'A' key
    );

    // Register the action with description
    let register = OwnedGaccelRegister::new(accel, command_id, "My Custom Action");
    session.plugin_register_add_gaccel(register)
        .expect("Failed to register action");

    // Register the hook command to handle execution
    session.plugin_register_add_hook_command::<MyHookCommand>()
        .expect("Failed to register hook command");
}
```

--------------------------------

### Register REAPER Control Surface Instance

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Registers an instance of a custom `ControlSurface` with the REAPER session. The returned handle can be used to unregister the surface later.

```rust
fn register_control_surface(session: &mut ReaperSession) {
    let surface = Box::new(MyControlSurface { track_count: 0 });
    let handle = session.plugin_register_add_csurf_inst(surface)
        .expect("Failed to register control surface");
    // Keep handle to unregister later if needed
}
```

--------------------------------

### Register REAPER Audio Hook

Source: https://context7.com/helgoboss/reaper-rs/llms.txt

Registers a custom audio hook with the REAPER session. This allows for real-time audio processing. The returned handle can be used to unregister the hook.

```rust
fn register_audio_hook(session: &mut ReaperSession) {
    let rt_reaper = session.create_real_time_reaper();
    let hook = Box::new(MyAudioHook {
        counter: 0,
        reaper: rt_reaper,
    });

    let handle = session.audio_reg_hardware_hook_add(hook)
        .expect("Failed to register audio hook");
    // Store handle to unregister later
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.