ALM Busy CircuitsMum M8 S950 Lowpass Filter


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ALM Busy Circuits MUM M8

ALM Busy Circuits presents MUM M8', an 8hp lowpass filter built from the same design as that of the Akai S950, albeit with the incorporation of voltage control, resonance, clipped saturation, and a VCA. The filter can be driven to self-oscillation at higher resonance levels, while its clipped overdrive works in tandem to its smooth core to push it into wasp-esque territory that affords a distinctly varied sound.

Mum8's filter cutoff enjoys dual voltage control with attenuation and inversion, and its resonance can operate under full voltage control. Beyond that, one of the module's inputs features an integrated VCA, which can be used to compound overdriven signals into the filter core.

Though the filter is analog, it is driven by a digital clock. This combination results in a characteristically smooth sound with high minimum cutoff that prevents any clock bleed. The cutoff point can be configured via trimmers on the reverse side, though there will still be some low-level artifacts present—which only adds to the filter's already distinct character.

MUM M8 Features

  • Modeled after the Akai S950 filter design
  • 6th Order Butterworth switched capacitor type filter design
  • Analog core controlled by high speed digital clock
  • High resonance yields self-oscillation
  • Two audio inputs, one with VCA
  • Eurorack module
  • 10HP Width
  • Current Draw: +12v 40ma / -12v 40ma
  • Depth: 32mm (including power header)
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Product Demo Videos
ALM MUM M8 Eurorack Version Of Akai S950 Filter
This video shows the ALM Busy Circuits MUM M8 eurorack filter which is based on the filter from the Akai S950 sampler. It also has a built in VCA and sounds great when overdriven.
54HP Episode 4: Lo-Fi Groovebox
On this episode of 54HP we built a lo-fi sample based groovebox case with the new Assimil8or as the sound generating core. This 8 track sampler and sample player can play back sounds as well as DC coupled CV sequences and modulation. The Assimil8or is capable of high quality sample playback as well, but features bit reduction and lo-fi aliasing options. Clock dividers and mathematical sequencers were used to trigger the samples and the Mum M8 filter adds some more lo-fi sampler character at the end of the chain.

Module List:
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Rossum Assimil8or
ALM Busy Circuits Mum M8
ALM018 - 'MUM M8' - Tone sweep
‘MUM M8’ is an 8hp Eurorack low pass filter building on the filter design used in the classic Akai S950 12 bit sampler with the addition of resonance, voltage control, clipped saturation and a dedicated VCA.
ALM Busy Circuits Mum M8 S950 Lowpass Filter Reviews