The system I have is using a Behringer Q502 box that is hooked up to my PC. Through this box I run my guitar while having backing tracks running from my PC. I use this as a learning tool. This works well with either

Interestingly, I can import using RealBand where 'So What?' is displayed. I can break the accompaniment down to its component parts (bass, piano and drums) but I can't hear it. The message from RealBand is as follows:

"Could not open the audio device. This can occur if another program is using the device in Exclusive Mode. It this persists, try rebooting the program."

I am a total technical illiterate. I don't know why this problem persists. I have downloaded and installed the necessary drivers for the Behringer but can't find where in either bb or RealBand to add them (if that is necessary) to these programs.