I've been looking into a rackmount preamp to add to my Mesa 400+(which I love). I'm looking for something similiar to the old ADA MB-1 but still in production. I'm looking to use the option of more than one channel to switch to a eq setting for fretless, one for fretted, or one for distiortion, etc. Any ideas? The only one's I could think of where the billy sheenan by Ampeg and the ADA.