Tech 21 Sansamp Programmable Bass Driver DIAlways thinking of our fat stringed brethren, we had to make a 3 channel, programmable, rig in a box for bassists who can't get enough of a great thing. Like the TRI A. C. for guitar, you get three hot tones right at your toetips. The all analog circuitry features the same controls as its single channel predecessor: Drive, Bass, Treble, Presence, Blend and Level. Digital only in its programmability, you just tweak the knobs until you find a tone,