So I'm looking for a preamp to use with my organ, actually, that can add some grit to my signal and have a large enough output signal to drive my Leslie (which is pretty low gain). Basically I want a vintage overdrive type of sound with a higher output level than a 9v pedal can give you. My boss overdrive is a little too quiet. I could run it over voltage but that might hurt it. Any (inexpensive) options? I'm not opposed to a rack preamp or whatever but is love to keep it in a 100usd budget.