Sound engineīoth the TB-03 and TT-303 have similar sound engine controls, though similar settings sound different - as they even do to some extent between original TB-303s.

Three flavours of distortion/overdrive open up its sonic palette, and a delay line can be used to add complexity and polish. Where the TB-03 wins, though, is with the built-in effects. Sadly, the Mix In on the Roland is not sent through the audio engine.

Much argument and misinformation surrounds the architecture of the original TB-303’s filter design, and it’s nice to see the TT-303 offer a way of injecting your own audio into the signal path for processing by the 24dB/octave four-stage diode ladder filter via the Filter In jack. This newer version also adds Loop Edit and Pattern Lab modes. There are options for automated pattern creation, pattern mutation and arpeggiation. The TT-303 Bass Bot, on the other hand, excels in pattern creation possibilities. Unlike the original, it is possible to move between Write and Play without stopping the sequencer. The TB-03 includes the original’s Pitch and Time write modes, but adds a more intuitive Step mode. The original 303 never had the most intuitive programming system, though it’s nudging serendipity to the fore was an important part of why it ultimately found fame. Both the 303 clones offer a plentiful supply of MIDI CC control for those who need to record and automate their knob twiddling. USB handles both MIDI and audio, allowing the TB-03 to be used as an audio interface The Bass Bot also features a full MIDI specification, and adds CV/Gate and Accent, plus Clock outs for interfacing with other analogue gear.

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