Nitpick: the JSFX audio effects you're referring to are scripted in EEL2. Reaper itself can be scripted with Python, Lua and EEL2 (see http://reaper.fm/sdk/reas

Nitpick: the JSFX audio effects you're referring to are scripted in EEL2. Reaper itself can be scripted with Python, Lua and EEL2 (see http://reaper.fm/sdk/reascript/reascript.php http://reaper.fm/sdk/reascript/reascript.php). It also has a C plugin API.