So historically, GP doesn’t really like the concept of changing plugin presets directly.
But there is a way to do it - it’s currently a bit of a pain to configure but it works.
Here is a trivial gig file that implements this. The trick is to use radio buttons and then for each button define both a min and a max *to be the same value using MIDI notation.
E.g, if you want one radio button to send MIDI program change 42 then you click on both the Min and the Max and set the value of both of them to 42m
Then assuming the radio buttons are mapped to the PC parameter of a MIDI In block, then the appropriate program change values will be sent out
SpecificPCNumbers.gig (162.3 KB)