The RMC BMT-220M-13 mono output audio only onboard preamp is designed for custom permanent installation on the side of a mandolin.
It features 4 sliding-style control surfaces for Volume plus Bass|Mids|Treble EQ. It is specifically tuned to produce a natural sound from the RMC AGT and AGS pickup sensor sets.
If your needs include MIDI, please reference the Poly-Drive II [outboard] and Poly-Drive IV [onboard] preamp systems.
NOTE: Fits Godin A-8 mandolin.