Special utility made to trigger scenes in the lighting application from lighting effects manufacturer "American DJ" called "MyDMX".
I bought "MyDMX" to control the lights of my live sound rig, but it lacks the feature of "Sound-to-light", so it cannot trigger lights to the sound of the band f.inst.
This plugin is designed to be put on a track that is in Input Monitoring mode, and it will then output Control Changes triggered by incoming audio.
These Control Changes can be sent to the "MyDMX"-application via "MIDI Yoke" from MIDIox. Set the track to output to the MIDI Yoke device, and now MyDMX should be able to learn the Control Changes and change scenes accordingly. Voila! Sound to Light!
(It may be necessary that you do not open MIDI Yoke as a MIDI Input in Reaper but only as output, as MyDMX is going to need the input).
Just thought I'd post it here in any case anyone would find it useful.