Tiptop Audio BD909 TR909 Bass Drum Generator, white pocket each producing a damped sine

each producing a damped sine wave at a different frequency

It can create filter sweeps

but with an input

Expansion 6 headers for connecting expansion modules e

Tiptop Audio BD909 TR909 Bass Drum Generator, white pocket each producing a damped sineReverse engineered from the original machine, the BD909 is an identical recreation of the original all analog drum circuit of the TR 909. With added additional control and synthesis features that turn this classic circuit into a chest pounding analog bass drum laboratory all tight packed into an 8HP module. The BD909 sound differs from the BD808 in that the main sonic energy is centered in the mid of low frequency range (as opposed to the low