in the soundtower editor, try that :
– combo mode
when you click on the edit button ( you want edit one voice) all voice get the same program ( in midi yoke a 220byte dump is sent and i can reproduce ). when you select an other program , ( a program change is sent on one voice) the voices get their orginal program
other problem, but i think it is a consequence of the first one, you are unable to edit a voice in the edition window : no sysex are sent. but if you select the voice 2, the program edition windows play with the voice one
you, can try to send a 220 byte dump in combo mode via midiox, the result is the same
i hope the probleme is not the same on all poly evolver
thanks for your help