In some particular sessions I have many instruments loaded on the many different ports/channels of my GS3 (let's say, 80 different samples...) Is there a quick way to transpose ALL the instruments at the same time a few semitones down?
I've been doing that through iMidi, but I have to click on each individual instruments to do it and it takes a long time.
The best way to do this is in midi. Select all midi tracks (i ex ctrl + a or draw a circle around the, with the mouse) and choose the transpose function. If you have non pitched percussion you will have to uncheck them (keep ctrl down and click on them).