Thanks for your help. I'm very new to all this technology and I'm lost as to where to start my investigation from. Should I look at my MIDI connections by listing them somehow, and see if there's something suspicious there? What would be a sensible procedure to follow? Many thanks. Alex >Sounds like a Midi thru problem. Perhaps you have an infinite loop and need >to break it somewhere. _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.com/