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MB 33

The MB 33 is a rack-mounted TB-303 clone released in the mid-nineties by German synth maker MAM (Music And More). It's basically identical to the Freebass 383 (which had a different front-panel design). It is a true analog monophonic bass synthesizer with MIDI implementation so you can create 303-like bass lines from your sequencer. Its single VCO offers the same two basic waveforms as the TB-303: a sawtooth and square wave. But in the MB 33 they can be mixed together for a more interesting tone than the 303 could originally produce.

Additional knobs control the VCO tuning, filter frequency cutoff, resonance, envelope mod amount, envelope decay time and accent intensity - the same controls found on the TB-303! The 24dB lowpass filter can also produce the characteristic sound of the 18 dB filter used in the original 303. There's also an auto-slide function (4 octave range) for producing those 303-style slides and a separate input for filtering external signals through it. Unfortunately there is no program storage.

MAM MB-33 II Image

MB 33 mkII

The MB 33 mkII (pictured above) released in 1998 adds a few more features. The 24dB filter has been replaced by an 18dB filter just like the original TB-303 used. A new sub-oscillator was added and can be mixed with the other two waveforms for even meatier mono-bass sounds. A new distortion effect is also present and can be dialed-in to dirty things up - sounds great when resonated at high frequency cut-offs! MIDI can send/receive controls for the cutoff, resonance, ENV mod, accent, decay, distortion, and autoslide on/off.

Whereas the original MB 33 and Freebass 383 before it sounded very much the same as the TB-303, the newer MB 33 mkII adds even more possibilities for creating your own unique 303-like sounds - and at a fraction the cost of an original 303!

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Demos & Media

Next! Superbass 4.4 Demo (aka mam MB33 mkII)


Polyphony - Monophonic
Oscillators - 1 VCO with mixable sawtooth and square waveforms.
MK II adds a sub-oscillator
LFO - None
Filter - MB 33: 24 dB/oct lowpass filter (MK II uses an 18 dB/oct filter) with cutoff-frequency, resonance, ENV-modulation controls
VCA - Decay-time (200 ms - 2,5 sec.) VCA separate ENV-generator with non controllable voltage assignment. ACCENT pot for accent-intensity; can be activated at velocity parameters greater than 120.
Keyboard - None
Memory - None
Control - MIDI, CV IN to VCF
Date Produced - 1996 (MB 33)
1998 (MB 33 mkII)


Images from MAM.