I was considering picking one of these up because I can get it really cheap. My question is....can you drive the tube to the point of distortion for metal vocals like you can with other tube units? Since it only has one knob I wasn't sure. Overall would it be a good buy for $300 cash out the door? In my tracking sessions I was going to use it for the following: -Kick w/D112 -Acoustic guitar -Bass DI -Guitar cab -Vocals Then I was going to use my on board pres for the rest of a drum kit. What do you guys think>?