I've been asked to fill in for a band who have some shows coming up. While rehearsing at home on my laptop using Amplitube software I've discovered that the tone I'm using on the computer (A scooped Trace Elliot GP250x) is infinitely more appropriate for the sound of this band than my actual amp, and I'd be keen to try it on in the rehearsal space. Problem is that I don't know if this is going to be possible and if so, I don't know if it will sound even slightly ok. Secondly I'm not sure how to do it. My plan was to run a patch lead from my external soundcard's headphone output into the GK and control the overall sound from the laptop. But the problem is I don't know where to stick the lead in. If I go into the input I'll get the GK preamp as well as the simulated preamp and I reckon that will land me in hot water. So is there a way to get around the GK preamp and go straight into the unit's power amp? Is this even worth trying? I'm assuming since the computer isn't running at line level I'm going to get some at least some hum. Any input would be appreciated. I've got a rehearsal with my main band tomorrow which I can use as a test run before I have to try it with the other band.