Can you use a guitar synth to control MyDMX?

Dave, Welcome to the forums.
I understand what your trying to do. I do not think it is possible to trigger steps in a scene with guitar synth. But you can use midi to trigger different scenes. all you have to do is figure out the best way possible to use a midi device to trigger the changes and assign midi trigger to the correct scene. It's all about organization. It's not a easy task for sure. Also keep in mind the program was never designed or intended for this type of playback.
Sincerely,

Thanks for the swift response, James!

You're going about this wrong.

First, you should look at the guitar synth as exactly that: converting guitar input into a MIDI signal(mainly note ON/OFF, volume and attack, as well as maybe channel and some can work on a per-string basis), but this is a PERFORMANCE device and as such, it's not a good match for triggering MyDMX.

What you want to do is perhaps start working to a click track or backing tracks using a second laptop or hardware sequencer. You can then trigger the scenes when you need them using MIDI notes and assigning the notes to scenes.

Another option would be to have some sort of floorboard MIDI controller with enough switches for you to trigger the scenes when you need them.

While triggering is a function of performance, it's not quite as applicable to MyDMX. A note to MIDI converter is doing real-time triggering but on a more "rapid fashion" manner. With lighting, chances are you're going going to be doing things that way, or at least not very often.

But for more clarification, are we talking about a true guitar synth system, or are we talking about a worn keyboard device in the general style of a guitar?