I just got this thing today, it sounds good with my USB soundcard and 5 dollar headphones (Albeit somewhat hot and each modification to the knobs raises or lowers the output dramatically). Anyway, at rehearsal today it sounded horrible and I have no idea what I was doing wrong. It absolutely ate up all the mids and left me with a huge pile of muddy bass and harsh highs even though Bass and Treble knobs were at around 3 and Presence was at around 4. Blend was set to 10 I think and Drive was between 5 and 7 depending on how much overdrive I wanted. Is this just the Sansamp sound or was I doing something wrong?