Ultimately, this is an incredibly simple amp. There are no effects (or effects loops) — jam your signal path into the front of the thing and play. Tone on this is like a guitar knob, cutting the highs to the left. The only bit of trickery in this device is the Ambiance knob, which affects a cabinet/speaker emulation. Fully counter-clockwise is a closed-back speaker cab, and fully clockwise is an open-back cab. This allows you the flexibility to respond to the environment in which you are playing to tighten up the ambient response when needed. Because the speaker is so small, even with the gain and volume all the way up, you’re still not moving the required amount of air to produce truly compressed gain tones, so drive pedals are basically a necessity here. You can help the situation by either adding ZT’s own extension cabinet , or hooking it up to your favorite 4×12. Six-and-a-half inches isn’t a lot of air, so forget your windmilling wall of sound and think more about cutting through the mix in virtually any environment.