Reaper to TouchOSC

Ask REAPER to run a few scripts over its web interface, ending with a .tosc file generated from the parameters of the last touched FX. The result is a layout of faders named after the FX parameters, with OSC messages to match.

Setup

1. Install REAPER, ReaPack and the SWS extensions.

2. Add this repository to ReaPack:

   https://raw.githubusercontent.com/AlbertoV5/ReaperTools/master/index.xml
   

3. Install all LISZT scripts from AlbertoV5-ReaperTools.

4. Set up Python in REAPER and install py2tosc and aiohttp into it.

5. Enable the REAPER web interface.

6. Load an FX and run the script.

Setting up Python in REAPER

Find your interpreter:

$ where python

Avoid Anaconda environments on Windows -- they have known issues with REAPER. Set the path here:

Web interface settings

All you need is the port. If you are running the script from another machine, change the host to REAPER's IP or use the access URL.

The trigger script

This part talks only to REAPER; the layout itself is generated by the LISZT scripts running inside it.

from dataclasses import dataclass
from hashlib import sha1
from pathlib import Path
import asyncio

import aiohttp


def hash_sha1(action_path: Path) -> str:
    """REAPER's action hashing, as of 6.57. https://askjf.com/index.php?q=6075s"""
    fixed = str(action_path).upper().replace("\\", "/")
    return f"_RS{sha1(fixed.encode()).hexdigest()}"


@dataclass
class Reaper:
    liszt_path: Path = Path("AlbertoV5-ReaperTools") / "liszt"
    host: str = "127.0.0.1"
    port: str = "9500"


async def ping(*actions: str) -> None:
    async with aiohttp.ClientSession() as session:
        for action in actions:
            url = f"http://{Reaper.host}:{Reaper.port}/_/{action}"
            async with session.get(url) as response:
                await response.text(encoding="UTF-8")


if __name__ == "__main__":
    asyncio.run(
        ping(
            hash_sha1(Reaper.liszt_path / "liszt-pull.py"),
            hash_sha1(Reaper.liszt_path / "liszt-generate.py"),
            "_S&M_OPEN_PRJ_PATH",  # optional, needs SWS
        )
    )

Write your own version of liszt-generate.py to shape the layout however you like.

LISZT scripts