Constant square wave in multi mode?
 

I have a Virus TI Polar and whenever I hook it up directly to my mpc 1000, I get an annoying square wave sound that plays everytime i play any key. It doesnt matter what midi channel I have it set to, I still get the square wave. Also sometimes when I hit more than one key or mpc pad at a time, the sound will stick until I hit the panic buttons. Any suggestions or anyone have a similar issue? I keep trying to call Access Tech but they are only open for 4hrs a day central time!

Kurt