#1
Hey, I was using Guitar Pro 5 and I have a track in this song which uses a cello, it was working fine before but for some reason now the cello won't play, and neither will any other instruments which don't use RSE, can someone please help me?

Thanks
#2
Sometimes, if you use MIDI with other software, it won't work on GP anymore. Try restarting. Usually works.
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#3
Failing that, click your volume control button in your taskbar, and look for the level that says SW Syntch, I think it is. If it's not up, turn it up.