Send program change
Apparently the "send program change actor is sending a +1 program number to midi, according to the "general midi 1.0 instrument list".
If I send for example the number 47 that should correspond to "47 Orchestral Harp" it will supply "48 Timpani"
I just tried with midi monitor and the numbers are correct coming out of Isadorafubbi
thanks fubbi, you are right, the SimpleSynth application is receiving +1. The midi-monitor I just downloaded shows that Isadora is sending the correct information!