I created a Bass preamp for those using acoustic Basses and players wanting to enhance their electric bass sound. It provides an ultra high input impedance for use with piezo pickups and features a low noise circuit just like my other pedals. Clean mode provides clean boost for low output pickups. Dirty mode mimics the sound of a classic tube amp so remains clean at low volumes and then harmonically enhances the tone at higher levels. Get those classic tones reminiscent of Yes, Cream, Rush and Iron Maiden without hauling around a full stack!