Hi, I recently built the Rod Elliot Guitar amp. It works fine now, no oscillation or anything bad. I was wondering if I could build a very simple hifi-preamp with an AUX-Input, with no tone controls or anything fancy and run it in the same poweramp as the guitar preamp. For playing backing tracks while I play the guitar. But how can I connect the 2 preamps ? One would apply voltage to the others output ? I guess that wont work well. Or does it ?