The attached manual is for the 2hp Rnd, a compact random voltage and random gate generator. Even though it is a single module, it can contribute a lot to melodic patching when paired with common Eurorack building blocks like quantizers, VCOs, envelopes, VCAs, clock sources, and sequencers.
Rnd provides three main outputs/functions:
This makes it useful for generating:
The INT/EXT switch changes the module’s behavior:
Gate out sends a steady 50% duty cycle clock
External
The manual states the quantized and smooth outputs are completely independent. That is very useful musically, because one can drive pitch while the other shapes timbre, transposition, or articulation.
Both random voltage paths have attenuators and can be adjusted from 0V to 10V. That wide range is important, because for melodic use you will often want to reduce the range before sending it to a pitch input or quantizer.
The most direct melodic patch:
Patch - Rnd Quant Output → external quantizer input - Quantizer output → VCO 1V/oct - Rnd Gate Output or another clock/gate source → envelope → VCA
Why it works - The Quant Output generates a new stepped random voltage on each clock pulse - A quantizer forces those random voltages onto a scale - Result: random but musical notes
Tip Since Rnd can output up to 10V, use the Quant attenuator to limit melodic range before the quantizer. Lower settings give tighter, more phrase-like melodies.
Because Rnd has its own internal clock, it can act like a self-contained melodic idea generator.
Patch - Set switch to INT - Rnd Quant Output → quantizer → oscillator pitch - Rnd Gate Output → envelope trigger - Envelope → VCA / LPG
Musical result - The module clocks itself - Every internal pulse creates a new pitch - The gate output provides matching rhythmic triggers
This is great for: - generative ambient lines - aleatoric sequences - quick self-playing patches
For more musical control, clock it from your system master clock, trigger sequencer, or clock divider.
Patch - Master clock / sequencer clock → Rnd Clock Input - Set switch to EXT - Rnd Quant Output → quantizer → VCO pitch - Rnd Gate Output → envelope trigger or logic module
Why this is useful - Notes now change in sync with the rest of your patch - Random gates add variation without drifting out of time - Great for techno, IDM, generative pop, and modular rhythm structures
Modules needed - Rnd - quantizer - VCO - envelope - VCA - filter optional
Patch - Rnd Quant Out → quantizer in - Quantizer out → VCO 1V/oct - Rnd Gate Out → envelope gate in - Envelope out → VCA CV - VCO out → VCA in → mixer/output
How to play it - In INT mode, use the Rate knob to choose melody speed - Adjust Quant attenuator for note range - Select a quantizer scale like minor pentatonic for always-pleasant results
Result A fully autonomous random melody voice.
Use both outputs together.
Patch - Rnd Quant Out → quantizer → VCO pitch - Rnd Smooth Out → attenuator/offset module → add to quantizer transpose input or oscillator FM very lightly - Clock externally or internally
Musical result - Quant Out creates note changes - Smooth Out slowly bends or transposes the melodic center - Feels like the melody is wandering through different tonal zones
This is one of the best uses of Rnd because the two random algorithms are independent.
In EXT mode, the Gate output becomes random.
Patch - Master clock → Rnd Clock In - Rnd Quant Out → quantizer → oscillator pitch - Rnd Gate Out → envelope trigger - Optional: mult the master clock to another voice for comparison
Musical result - Pitches update with the clock - Notes only sound when random gates fire - Creates rests and syncopation automatically
This is excellent for making melodies less rigid.
Although Smooth is continuous, you can still make it melodic.
Option A - Rnd Smooth Out → quantizer → oscillator pitch
This gives constantly shifting pitch, but may glide unpredictably depending on the quantizer behavior.
Option B - Rnd Smooth Out → sample and hold input - Clock source → sample and hold trigger - Sample and hold out → quantizer → oscillator pitch
Result - Smooth becomes a slowly evolving source from which discrete notes are sampled - This often sounds more “composed” than pure stepped randomness
If you have two oscillators or two voices:
Voice A - Rnd Quant Out → quantizer → VCO A pitch
Voice B - Rnd Smooth Out → another quantizer or sample/hold/quantizer chain → VCO B pitch
Rhythm - Use Rnd Gate Out for one voice - Use a regular clock or divided clock for the other
Result One voice sounds stepped and phrase-like, while the other sounds more fluid and unstable. Together they create a layered melodic texture.
Because Rnd outputs 0–10V, raw output can span a huge pitch range. For melody, that often means too many octaves.
Use the onboard attenuators to: - keep melodies within 1–2 octaves - reduce wild jumps - make phrases feel intentional
This is probably the single most important technique when using Rnd melodically.
The manual calls one output “Quant,” but from the description it means stepped random voltage, not necessarily scale-quantized to musical notes. If you want melodies in key, use an external quantizer.
If you want the random melody to sit inside a song structure: - drive Rnd from Pamela’s, a sequencer clock, Tempi, etc. - use clock divisions for slower pitch changes - reset other modules around it for repeatable larger structures
A very strong melodic workflow is: - Quant output = note selection - Smooth output = timbre, transpose, filter cutoff, wavefold amount, FM depth, or vibrato depth
That keeps the melody coherent while giving it motion.
Rnd works especially well with:
The 2hp Rnd is best thought of as a compact melodic unpredictability source. Its Quant Output is ideal for stepped note generation, its Smooth Output is perfect for slow melodic drift or expressive modulation, and its Gate Output can provide either a regular pulse or random rhythmic articulation depending on clock mode.
For melodic music, the most effective setup is:
That patch gives you an evolving, musical, and controllable generative voice.