The Tiptop Audio SD909 adapts the iconic TR-909 snare drum and noise generator for use in the Eurorack modular synthesizer format. Tiptop painstakingly tested the module in their lab to sound like a fresh machine coming off of the assembly line back in the 80s. On top of the original circuit, new features have been added expanding 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.



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