This short post describes the best way to automate a change between the instrument / player mode of a tonal UJAM Instrument, like Virtual Guitarist (VG) or Virtual Bassist (VB)
You have created a track with phrases of e.g. a Virtual Bassist as a bassline. At the end you want to let the last note ring / fade out instead of playing the whole phrase again.
Insert C-2 below the note which has to ring / die away.
There is no automatable parameter to switch between modes, however, inserting a MIDI note on "C-2" ("C *dash* 2" - NOT "C2") switches the plug-in from Player into Instrument mode. Below you can see an example of this technique:
In this screenshot the first MIDI clip (top left, red) contains only one note but triggers a pattern of "VB-DANDY". You can see the resulting audio in the track below (blue). Note the multiple transients, each indicating a new stroke on a "string". In the following bar the exact same MIDI is used, BUT with a "C-2" (yellow) at the same timestamp, forcing the VST into Instrument Mode and letting the note ring. Note the uninterrupted decay of the last stroke.
IMPORTANT: The UI of the plug-in won't change when switching between modes. This means the following toggle will stay like it is, don't let it fool you.