Analog Drum Modules
Reverse-engineered from the original machine, our BD909 is an identical recreation of the original all-analog drum circuit of the TR-909. We’ve added additional controls and synthesis features that turn this classic circuit into a chest-pounding analog bass drum laboratory – all tightly packed into an 8HP module. The BD909 sound differs from our BD808 in that the main sonic energy is centered in the mid to low frequency range (as opposed to the low frequency range of the BD808). This frequency range gives the needed headroom allowing your bass lines to deeply fill up the low end while the kick drum rides on top – creating a clear and punchy mix.
The BD909 includes all the controls found in the original: Attack, Decay, Tune Decay, Accent and Level. We have gone beyond that and added controls that further increase the palette of sound this circuit is capable of. First off, we’ve added a tuning control knob for the oscillator and included its own CV input and attenuator that let you tune 909 kick with your bass lines. Next, we added control knobs for the tuning attack and extending tuning delay – each one affects the other, allowing for intuitive and interactive sound shaping – this feature opens up numerous “sweet spots”, and provides the ability to center the energy peak at different parts od the sound. Finally, we offer additional punch and distortion by giving complete control over the internal waveshaper, which allows you to overload the waveform manually or with voltage control.
Beginning with the classic and pure sound of the 909 kick, these additional functions greatly expand the BD909’s flexibility and let it create powerful analog bass drums that range from soft and smooth to punchy and aggressive – sand everything in between.
Size: 8HP – Depth: 33mm – Power: +12V 34ma / -12V 21ma
The CP909 is the TR-909 clap sound analog generator in Eurorack format. This is yet another low-cost analog drum generator from a legendary drum machine in your modular synthesizer, expanding your Tiptop Audio modular drum machine even further.
The CP909 is an exact reproduction of the original analog circuit and with the addition of just one extra knob, “trashing” the frequency of the internal noise generator, we have added greatly to the spectrum of sounds that can be generated all that without compromising the signature sound of the TR-909.
The CP909 clap effect is made by a special triple-saw envelope generator that controls the gain of a VCA. The sound source feeding into the VCA is made by a quasi-random logic based noise generator, some might call it “digital noise” though this term might be misleading in today’s world of microcontrollers and sound samples. What really makes the noise generator is a ring of logic gates, so primative so 80’s and that’s the sound of the 909 Clap!
The CP909 includes a high-powered output gain stage capable of producing hot signals. On the inputs, we have designed a pulse-shaper circuit so you can trigger the CP909 with trigger/gate signals from step sequencers, clock, dividers, or any other pulse/clock sources. This eliminates the need to shape pulses sent to the module and ensures the same stable sound at peak power, regardless of your pulse source. Based on the architecture of the 909, the Accent input is versatile and able to take in both CV and Gate signals for continuously changing dynamics. All these unique features make integrating this legendary sound generator into your modular synth easy, unleashing the power of real analog drums.
Size: 4HP – Power: +12V 6ma / -12V 10ma
The SD909 adapts the iconic TR-909 snare drum and noise generator for use in the Eurorack modular synthesizer format. We painstakingly tested the module in our lab to sound like a fresh machine coming off of the assembly line back in the 80s. On top of the original circuit, we have added new features that expand the palette of what can be produced with this analog circuit.
The sound of the SD909 consists of two main sections: the binary noise generator and two modulated triangle oscillators. The oscillators provide the low end punch while the noise makes up the upper sonic spectrum, resulting in a combination that makes the 909 snare sound so rich. In the SD909 module the noise generator and oscillators are variable and voltage controlled, which pushes the circuit beyond its original boundaries offering new sounds as well as many variations of the original tone. The panel has markings to guide setting the knobs to reproduce the snare sound of the vintage machine.
Just like the other drums in this series, the SD909’s high-powered output gain stage allows further enhancement of the sound through distortion and clipping. We have designed a dual pulse-shaper circuit on each gate input so you can trigger your SD909 with Trigger/Gate signals from step sequencers, clock dividers, or any other pulse/clock sources. Also, the SD909 is equipped with access to the MIXZ MixBus matching the rest of the Tiptop line of percussive modules.
Size: 8HP – Depth: 1.8″ – Power: +12V 35ma / -12V 30ma