Midi playback in Reaper: how to change instrument?

go into your midi and delete any info you dont need. the things like midi pan will be on the far left of the midi editor below the piano roll in a drop down menu. the items that have guitar pro info will have a dot next to it so you can only delete the ones you need to.
 
go into your midi and delete any info you dont need. the things like midi pan will be on the far left of the midi editor below the piano roll in a drop down menu. the items that have guitar pro info will have a dot next to it so you can only delete the ones you need to.

This ^
To speed things up, create a custom action that does the following:
Select all CC events
Edit: delete events


Import the GP midi tracks, open the midi editor, select all notes Ctrl+A and run the custom action.

cc.png


EDIT: oh, and to change instruments I would insert the built-in ReaControlMIDI vst like this:

gm.png