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Tiptop Audio - BD909


The BD909 is a recreation of the Rolands TR-909 analog bass drum sound generator adapted for the Eurorack module format. This name might technically be misleading – in some knob positions you will get the classic 909 kick, but there is way more potential in there – it’s really a little analog bass drum laboratory that has new tune attack control that creates many more sweet spots than the original. It can go low, high/smooth/harsh, and anywhere in between; it can also go weird with the featured VC inputs. If you’re used to the BD808 then this will take a bit of time to get used to because it is a different beast, although with some adjustment you might get similar sounds. With such dense circuitry on the PCB it wasn’t easy for TTA to fit everything in there, but it was certainly well worth the challenge.


  • Output level – 0 – 10v
  • Original 909 attack control
  • Extended 909 decay control for more oomph

New controls for the oscillator tuning:

  • Attack tune,
 decay tune – these two controls have an effect on each other making really interesting sweet spots
  • Global oscillator tune control – this sets an offset for the oscillator, sets the starting frequency for the envelope
  • VC-tune with attenuator (can go over a wide range)
  • Overload knob – might not be everyone’s cup of tea, what it does is overload the sine shapers which adds harmonics and some extra punch. It’s an aggressive effect.
  • VC – overload – can be CV or even audio
  • Accent in – can be with a pulse or CV 0 – 5v
  • Accent attenuator
  • Gate in
  • Panel size: 8 hp


Other modules by Tiptop Audio | Z3000 Smart VCO MKII | Z5000 VC DSP multi-effect | Z2040 4-pole VCF | Z8000 Matrix sequencer Mk II | Z-DSP VC | Z-DSP – Error Codes #1 Cartridge | Bat Filter VCDF for Z-DSP | SEGOH – BIT ROT DSP CARD | Numberz | Numberz Blank Cartridge | Stackcable – Yellow 50cm | Stackcable – Blue 70cm | Stackcable – Red 30cm | Stackcable – Black 90cm | Stackcable – Purple 150cm | Stackcable – Green 20cm | SD808 | HATS808 | HATS909 | CP909 | CYMBL909 | BD808 | CB808 | Trigger Riot | Zeus Access | Z4000 | MIXZ | MA808 | RS808 | uZeus with flying bus boards | QuantiZer | Circadian Rhythms | Fold Processor | TOMS909 | RS909 | ONE | TG ONE | SD909