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Notes: Introducing the SD808, part of our new series of drum modules that brings analog percussion to the modular synth world, instantly turning your system into a self-contained music machine.

The SD808 is the TR-808's analog snare drum circuit adapted for use in Eurorack modular synthesizer format and was designed to sound like a fresh-out-of-the-box, 1980s TR-808 snare. Adapting the circuit to the modular format has allowed us to add special features like independent accent levels, a high-powered gain stage, a dual-input pulse-shaper, and an adjustable noise source - all without compromising the signature sound of the TR-808 snare drum.

The SD808 sounds tight and extremely snappy because it's analog - the real thing, not samples. The sound is made with three analog sound generators mixed together: two oscillating sine waves and a noise source. The SD808's front panel controls have a lot of sweet spots with sounds that are not just limited to snare drum sounds; it can also create other electronic percussive elements.

The noise source generator in the original TR-808 machines were revised in later production batches, resulting in variations in sound across the production run. The SD808 uses this later, revised circuit to create a snare drum hit that is slightly darker, has more body, and is more realistic. Just like other drums in this series, the SD808 includes a high-powered output gain stage capable of producing signals up to 20Vpp, allowing you to get an array of harmonized snare drums sounds with even tighter attacks. On the inputs, we have designed a dual-input pulse-shaper circuit so you can trigger the SD808 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. All these unique features make integrating this legendary sound generator into your modular synth easy, unleashing the power of real analog drums.

Notes: Introducing the HATS808, part of Tiptop Audio's new series of drum modules that bring analog percussion into the modular synth world, instantly turning your system into a self-contained music machine.

The HATS808 is the TR-808's real, analog closed and open hi-hat circuits adapted for use in Eurorack modular synthesizer format and tested to sound just like it did back in the 80's. Adapting to modular foramt has allowed Tiptop Audio to add some special features for each voice, like independent accent levels, a high-powered gain stage, and a dual-input pulse-shaper. Filter Q and VC-Q knobs were added to the main band-pass filter for additional tuning and to allow you to generate crushed tones and self-oscillation at the knob's max position - all without comprimising the signature sound of the TR-808 hi-hats.

The HATS808 sizzling sound is made using six analog square wave oscillators mixed and processed by band-pass filters. This multi-oscillator design is what give the 808 hi-hat sounds their unique metallic character and akes each HATS808 sound slightlty different from one-another. The original "choke" circuitry that makes it sound so dynamic and tight is fully implemented, just like the original, but can also be disabled if needed, by disconnecting the internal connection between the two hats.

Just like the other drums in this series, the HATS808 high-powered output gain stage allows you to further harmonize the sound using distortion and clipping. On each input, there is a dual pulse-shaper circuit so you can trigger your HATS808 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. All these unique features make integrating this legendary sound generator into your modular synth easy, unleashing the power of real analog drums.

Notes: Welcome to the Forbidden Planet, an all analog multi-mode filter design influenced by the 1975 Steiner-Parker Synthacon model. Control the Forbidden Planet manually or through CV and take the sound of your Eurorack into new orbits.

Forbidden Planet has three filter input jacks: High Pass, Low Pass and Band Pass. The High Pass section is this module's signature sound - a crisp sharp-cut with no residue, designed to add High Pass filtering capability to Tiptop Audio's wide range of Eurorack modules. Send a throbbing kick drum through the High Pass section and filter out the the rumbling lows while maintaining the pulse of the beat. The Bandpass is clear and useful in isolating a pie-slice-range-of-frequencies while cutting off the low and highs, great for accurate sound design or sculpting audio into that sweet spot. The Low Pass is an airy classic 12db two-pole analog slope ideal for monophonic synth patches and filtering down to the essential low-end bass we all love.

The Forbidden Planet Resonance utilizes an internal feedback path which can sound smooth or aggressive depending on the knob setting. At a low setting, it emphasizes the cutoff harmonics, at middle settings it begins to self oscillate, and towards maximum setting it forms interesting tones and all sorts of chopped grainy bits of self-oscillation perfect for entering into a sci-fi world.

The Forbidden Planet is an impressive multi-mode analogue filter which adds a broader filter spectrum to the Tiptop Audio modular family and unlocks forbidden creative possibilities in a small package.

Size: 8HP
Depth: 30.5mm
Power: +12V 10ma / -12V 10ma

Notes: The Fold Processor is a voltage-controlled wave multiplier and sub-octave generator. The circuit is based on a classic diode design that adds odd harmonics by folding the incoming signal, followed by subdivided square waves.

The wave folder creates new waveforms from standard sine, triangle, sawtooth, and square waves and includes a CV input with an attenuator, making it very easy to create beautifully animated folding sounds. Adjustable voltage-controlled Inject alters the bias point creating an even wider palette of sounds.

The subdivide generator squares the fold output generating 4 more sounds spaced one octave apart, each with its own gain knob and mixed to the Subdivide output jack. Mixing the four can create anything from discordant square wave swarms to sweet harmonic oscillator stacks, from a stable square version of the folded wave to freaky PLL-like glitched slides.

Overall results can sound evil at times and sweet at others, a true multi-faced devil.

Size: 12HP
Depth: 31mm
Power: +12V 60ma / -12V 55ma

Notes: 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 clap.

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 primitive, so BO'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.