music/daw/reaper/ MyReaperOscJourneyPart1

So the first thing I did was get PythonOsc and some trivial send/receive scripts (see here. One receives (on port 7001, which for laziness I hardwired into the script) and the other wraps the client.send_message so that I can load it in an interactive python session, send arbitrary OSC messages to Reaper, and see the OSC feed from reaper dumped out in a separate window.

Things are defined in the ${REAPER_RESOURCE}/OSC folder, in e.g. Default.ReaperOSC. I made a copy of this in Jda.ReaperOSC so that I can tweak it.

To configure it in Reaper, go to Preferences→... (insert screenshots here)

First thing I noticed, is that when hit ok in the OSC setup dialog, Reaper sends a ton of information, much of which is essentially irrelevant. There is probably a good reason for this. If you have only one device in the FX chain on track 3, it still sends values for the non-existent 3rd device, including all its non-existent parameters. It seems it is for things like TouchOSC where it presumes there is a fixed bank of faders or knobs to talk to.

Now with the default osc setup, we can send e.g.

n/track/3/fx/2/fxparam/17/value 0.5

and provided the fxparam number is in the range specified at the top of the osc definition file, when we change the value, it will send

/track/3/fx/2/fxparam/17/value 0.4