# 2hp — Grain - [Manual PDF](../../manuals/2hp_Grain_Manual.pdf) --- [Manual PDF](#) # 2hp Grain — creating melodic components Based on the attached manual, this module is: - **2hp Grain** - A **granular audio processor** - Designed to turn an incoming audio signal into **pitched grains, clouds, microsound phrases, and textures** - Particularly useful for deriving **melodic material from existing sound sources** ## What Grain does musically Grain is not a traditional oscillator. It needs an **audio input** and then creates grains from that incoming sound. The melodic strength comes from two things: 1. **Pitch control over the grains** - The **Freq** knob shifts grain pitch from **-4 octaves to +4 octaves** - The **V/Oct** input allows **pitch-accurate sequencing** 2. **Controllable grain generation** - **Density** determines how often grains are created and how they behave: - **Left side**: periodic grains - **Center**: no grains - **Right side**: stochastic grains - Higher **Freq** also makes grains **smaller** and increases **generation speed** That means Grain can act like a hybrid of: - a pitch shifter - a granular voice - a texture-to-melody converter - a sampled microsound instrument driven by external audio --- ## Panel summary From top to bottom: - **In** — audio input - **Density CV** — CV control of grain density, **-5V to +5V** - **Density knob** — periodic ↔ stop ↔ stochastic grain behavior - **Mix CV** — CV control of dry/wet mix, **-5V to +5V** - **Mix knob** — dry input ↔ fully granular output - **V/Oct** — pitch control for grains, **1V/oct**, range **-1.5V to +5.5V** - **Freq** — pitch shift amount and indirect grain-size/speed behavior - **Out** — audio output --- ## How to use Grain for melodic parts ## 1. Turn any oscillator into a granular lead voice ### Patch - Patch a basic oscillator, wavetable oscillator, or harmonically rich voice into **Grain In** - Patch a sequencer or keyboard CV into **V/Oct** - Take **Out** to your VCA/filter/output chain - Set **Mix** mostly or fully wet ### Why it works The incoming oscillator provides a stable harmonic source. Grain then re-pitches and re-articulates slices of it. Because **V/Oct** tracks pitch, you can sequence melodic lines while the granular engine adds motion and texture. ### Best settings - **Density** slightly left of center for regular grain pulses - **Freq** near center for recognizable pitch, or above center for brighter, smaller grains - **Mix** 75–100% wet for a clear granular melody ### Result - crystalline lead lines - digital plucks - shimmering arpeggios - “frozen” melodic textures --- ## 2. Derive melody from a drone ### Patch - Send a sustained drone, chord, or noise-rich source into **In** - Sequence **V/Oct** - Put **Mix** fully wet - Set **Density** left of center for periodic grain generation ### Why it works A static sound source becomes raw material for granular extraction. The sequence on **V/Oct** imposes melodic contour onto the grains, even though the source itself may not be playing notes. ### Musical use This is excellent for: - ambient melodies - ghostly countermelodies - evolving intros - melodic overdubs derived from one sustained sound ### Tip If the source is harmonically dense, the melody will feel more spectral and complex. If the source is simple, the melody will sound clearer and more tonal. --- ## 3. Use percussion as a melodic grain source ### Patch - Feed a hi-hat loop, click track, snare, or short percussive sound into **In** - Sequence **V/Oct** - Set **Density** around the periodic side - Increase **Freq** for tighter, faster grains ### Why it works Granular processing of percussive sound often produces tiny pitched fragments that feel like mallets, bells, or glitch plucks. ### Result - melodic glitch lines - pointillistic arps - IDM-style micro-melodies - tuned percussion textures This is one of the most interesting melodic uses of Grain because it lets rhythm become pitch. --- ## 4. Crossfade between original note and granular harmony ### Patch - Input a melodic source into **In** - Send the same pitch CV used by the original voice to **V/Oct** - Modulate **Mix CV** slowly - Send Grain output alongside or instead of the original voice ### Why it works The **Mix** control blends dry source and granular-processed material. If your source is already melodic, Grain can add a pitched parallel layer that moves between recognizable note and transformed note-cloud. ### Result - melody with shadow harmonics - call-and-response between dry and granular versions - expressive morphing lead tones ### Good modulation idea Use a slow triangle or envelope into **Mix CV** so phrases bloom from dry to granular. --- ## 5. Build stochastic melodic textures ### Patch - Send a sustained or looping sound into **In** - Sequence **V/Oct** with a sparse melody - Turn **Density** to the right of center for stochastic grain behavior - Keep **Mix** wet or mostly wet ### Why it works On the right side, Grain generates grains stochastically. The pitch can still be guided by **V/Oct**, so you get melodies that are recognizable but unstable and alive. ### Result - fluttering melodic clouds - unstable generative lines - aleatoric upper voices - “particle” melodies This is especially effective in ambient, experimental, and soundtrack-oriented patches. --- ## 6. Make octave-shifted melodic doubles ### Patch - Feed a melodic line or oscillator into **In** - Sequence **V/Oct** - Use **Freq** to shift the grain pitch up or down in octave ranges - Blend with **Mix** ### Why it works Since **Freq** spans **-4 to +4 octaves**, you can create upper or lower pitched doubles from the source material. ### Musical uses - sub-octave granular bass reinforcement - high octave sparkle above a melody - layered “12-string” type shimmer - artificial harmonics and register spreads ### Tip Keep **Density** moderate so the pitch remains legible if you want clearly melodic results. --- ## 7. Use Grain as a playable microsound voice ### Patch - Feed in a complex audio source - Set **Mix** fully wet - Sequence **V/Oct** from a keyboard or sequencer - Fine tune **Freq** - Use external envelopes/VCA after Grain for articulation ### Why it works At full wet, Grain becomes less like an effect and more like a voice derived from captured audio. Because pitch is externally controllable, you can “play” the buffer material melodically. ### Result - playable sample-cloud voice - expressive digital lead - granular pseudo-sampler - unusual tuned textures without a dedicated sampler --- ## Important behavior to exploit ## Density is not just “more or less” It changes the *character* of note production: - **Far left**: grains become periodic, increasingly fast as you move further left - **Center**: grain generation stops - **Right**: grains become stochastic, increasingly fast as you move further right So for melody: - use **left side** for rhythmic, clock-like note definition - use **right side** for loose, animated, probabilistic melody - avoid center if you want continuous grain output ## Freq affects more than pitch The manual states that as **Freq increases**: - **grain size decreases** - **grain generation speed increases** So high Freq settings give: - brighter - smaller - more active - more sparkling melodic output Low Freq settings give: - larger - slower - heavier - often more smeared output This interaction is key to shaping whether a melody feels like: - a clean plucked line - a shimmery cluster - a stretched, spectral phrase --- ## Best input sources for melodic use Since Grain depends on incoming sound, source choice matters a lot. ### Best for clear melodies - saw or pulse oscillator - simple FM tones - tuned percussion - vocal phrases - plucked strings or string-like synths ### Best for textural melodies - filtered noise - pads and drones - field recordings - percussion loops - chords or full mixes ### Best for strange but musical results - speech - metallic percussion - resonant filter pings - feedback tones - wavefolded audio --- ## Practical melodic patch recipes ## Patch 1: Granular lead - Oscillator → **In** - Sequencer CV → **V/Oct** - **Mix** full wet - **Density** slightly left of center - **Freq** slightly above center **Sound:** articulate digital lead with sparkle --- ## Patch 2: Ambient melody from noise - Filtered noise or drone → **In** - Slow sequencer → **V/Oct** - **Density** right of center - **Freq** around center or slightly high - **Mix** full wet **Sound:** drifting, unstable, airy melody --- ## Patch 3: Tuned glitch percussion - Hi-hat/snare loop → **In** - Fast sequencer or random quantized CV → **V/Oct** - **Density** left of center - **Freq** high - **Mix** full wet **Sound:** tiny tuned clicks and glassy percussive notes --- ## Patch 4: Morphing melody layer - Main melodic voice → **In** - Same pitch CV → **V/Oct** - LFO or envelope → **Mix CV** - **Density** moderate - **Freq** to taste **Sound:** melody that fades between natural and granular versions --- ## Patch 5: Granular bass accent - Bass oscillator → **In** - Bass pitch sequence → **V/Oct** - **Freq** below center - **Density** moderate left - **Mix** 50–100% wet **Sound:** gritty, broken, sub-rich bass ornamentation --- ## Performance tips - **Use Mix as a phrase control**: dry for clarity, wet for transformation - **Sequence V/Oct conventionally** if you want actual note lines - **Modulate Density CV** for evolving articulation - **Keep Density on the periodic side** for more rhythmically readable melodies - **Push Density stochastic** for fills, transitions, and generative passages - **Raise Freq for smaller, more agile grains** - **Lower Freq for heavier, slower, more smeared notes** --- ## Limits and workflow notes From the manual, Grain has: - one **audio input** - one **audio output** - CV over **Density** and **Mix** - **V/Oct** for pitched control That means Grain works best in a larger melodic patch when paired with: - a sound source to feed it - a sequencer or keyboard for **V/Oct** - envelopes and a VCA after the output - possibly a quantized random source for semi-generative melodies By itself, it is **not a complete standalone melodic voice**. It becomes one when supplied with: 1. source audio 2. pitch CV 3. downstream articulation/amplitude shaping --- ## Bottom line **2hp Grain** is excellent for making melodic material out of almost any sound. Its strongest melodic roles are: - **granular lead voice** - **pitched texture generator** - **melodic layer derived from drones or loops** - **glitch arp / microsound instrument** - **wet/dry morphing harmony processor** If you patch it with a stable source and a sequencer into **V/Oct**, it can produce very playable and musical melodic lines. If you feed it noisier or more complex material, it excels at creating **organic, unstable, and highly characterful melodic fragments**. [Generated With Eurorack Processor](https://github.com/nstarke/eurorack-processor)