Psycle doesn't offer this feature natively, but you may try sending an mcm command with a program change
this would be like this:
mcm C0 01 xx00
where C0 means change program on midi channel 0,
01 is the machine
and xx is the program index (from 0 to 7F).
Of course, this will only work if the VST supports program changes, and not only Presets.
<[JAZ]> Pa pi pa pa pa pi pa.... ;ĚD