It's basically two Sansamps in parallel @dave_bass5, one has the gain and EQ pre set, the other adjustable via the controls, then the deep/drive control adjusts the blend between them. So it should be just as, if not more versatile as a BDDI or VT Bass, and they are no one-trick ponies. Looking forward to trying one, I could never persuade myself to get the preamp, but don't need much persuading to get the pedal!