“Modded Out” Analog Bass Line Synthesizer with VCO, MIDI-Controllable VCF and Sub-Harmonics Oscillator. Sometime after the release of the original TB-303, creative users realized that there was more to squeeze out of an already amazing bass machine, to produce sounds that were unique to themselves. As word started spreading about third-party mods adding more functions and many more ways to shape sounds, synth-heads around the world wanted to get their hands on a modded TB-303. Now it’s a lot easier to get that awesome “modded-out” sound with the Behringer TD-3-MO-BK, an ultra-affordable and faithful homage to the iconic synthesizer that’s capable of creating some fiery basslines and much more now in a sleek black enclosure. With its pure analog signal path, 16-step sequencer and authentic VCO, VCF and VCA filters, the TD-3-MO-BK is sure to become one of your favorite synthesizers.