From some prints/ oprints of this device it seems it is not possible to access the target-instrument index/ object i.e.  VST:Twin 2 (Default Sound)
Nor is it possible to change the parameter target popups? Master Tune, Master Scale, Osc 1 Detune …etc Though I have a suspicion that the latter could be changed via presets?
Checked and this can be changed via setting the preset string, not neat but at least possible.
6186 Inst. auto.PNG
Could anyone confirm about the inst selection for me please?