# Schlappi Engineering — 100 Grit - [Manual PDF](../../manuals/100_GRIT_MANUAL_20190826.pdf) --- [100 Grit Manual PDF](attachment) # Using Schlappi Engineering 100 Grit for Melodic Music The **Schlappi Engineering 100 Grit** is often described as a touch-controlled distortion/filter/performance instrument, but it can absolutely be used to create **melodic material**, not just noise and destruction. From the manual, the key melodic building blocks are: - a **low pass transistor ladder filter** - a **VCA** - a **distortion stage** - **filter FM inputs** - **resonance behavior that can approach self-oscillation** - **touch points** that act like resistive patch points into circuit nodes - several **internal feedback normalizations** that can turn the module into a playable voice or animated processor Because this manual only covers **one module**, the most useful way to answer your question is to explain how the **different sections of the 100 Grit work together** to produce melodic components such as: - tuned filter pings - basslines - distorted leads - FM-like tones - self-oscillating sine-ish melodic voices - animated harmonics that follow pitch CV --- ## What in 100 Grit is useful for melody? ## 1. Filter as the pitch-bearing core The manual says: - **FM1 and FM2 sum together and control the cutoff frequency** - **FM2** can be used for **V/OCT CV to roughly track along with incoming signal** - the filter can be trimmed so resonance **just starts to self-oscillate** This means the filter is not just a tone shaper — it can become a **quasi-oscillator** or at least a **pitch-emphasizing resonant core**. ### Melodic implications - Send **1V/oct or sequencer pitch CV** into **FM2** - Raise **RES** - Tune **FREQUENCY** to the desired range - Use **OUT** for cleaner melodic material or **DIST** for a more aggressive voice This likely won’t behave like a precision oscillator, but it can produce: - rough melodic tracking - tuned resonant notes - acid-like lines - screaming leads with recognizable pitch centers --- ## 2. VCA lets envelopes articulate notes The manual is clear that: - **GAIN controls the gain of the VCA** - **No sound will come out of either output without some initial gain** - **5V at GAIN CV gives unity gain** - you can use **GAIN CV** as a normal VCA control input ### Melodic implications A VCA is one of the main things needed to turn a continuous tone into a **note phrase**. Use: - envelope to **GAIN CV** - pitch CV to **FM2** - gate/trigger to your envelope generator - output from **OUT** or **DIST** This gives you a standard melodic voice structure: **pitch CV → FM2** **envelope → GAIN CV** **audio source or self-oscillation → audio path** So even though 100 Grit is wild, it can still function as a classic **articulated mono synth voice**. --- ## 3. Resonance can make tones sing or self-oscillate The resonance section is especially important melodically. From the manual: - **RES controls resonance** - **RES CV** can modulate resonance - internal resonance trim can be set so the filter **just starts to self-oscillate** - removing the **Input to Resonance header (J9)** changes the character and allows self-oscillation to overtake the input signal more strongly ### Melodic implications This enables at least three melodic uses: #### A. Resonant filtering of an existing oscillator Patch an oscillator into **IN1** and use: - **FM2** for pitch-related movement if desired - **RES** to emphasize harmonics - **GAIN CV** for note articulation This yields strong melodic bass/lead processing. #### B. Filter ping voice With high resonance and short envelopes into frequency or gain, the module can behave like a **pinged resonant filter**, producing percussive but pitched notes. #### C. Self-oscillating voice If trimmed appropriately and set for strong resonance, the filter can become a **standalone tone source**. Then: - sequence **FM2** - envelope **GAIN CV** - monitor **OUT** This is one of the clearest ways to get melody directly from the 100 Grit without another oscillator. --- ## 4. Distortion can preserve melody while adding harmonics The distortion path is not just chaos. The manual states: - **DIST** is the output of the distortion circuit following the VCA - **GAIN** controls how hard distortion is pushed - the **x100** switch gives extreme distortion ### Melodic implications For melodic work, distortion helps in two ways: #### A. Make simple melodic lines more present A basic sine/triangle/saw into 100 Grit can become: - thicker bass - screaming lead - harmonically rich sequence #### B. Create pitch-rich resonant tones When resonance is already near oscillation, the distortion can turn a plain resonant tone into: - acid basslines - industrial melodies - unstable but still trackable solos For melody, it is often best to start with: - **x100 off** - moderate **GAIN** - moderate **IN1** - use **OUT** and **DIST** alternately to hear where pitch remains clearest Then engage **x100** once the line is established. --- ## Internal interactions that matter for melodic patching ## 5. Normalizations can animate a melodic voice One of the most interesting features in the manual is that **unused inputs have internal feedback normalizations**. These can make a melodic patch much more alive. Key normalizations: - **IN1 normalled to DIST2** - **IN2 normalled to DIST** - **FM1 normalled to DIST** - **GAIN CV normalled to POLE 2** - **RES CV normalled to DIST** These are active only when the input is **unpatched**, and the associated control must be turned down if you do not want its effect. ### Melodic use of each normalization #### IN2 ← DIST The manual says this acts as a **distorted resonance path in opposition to RES**. Use this for: - more vocal melodic tones - unstable harmonic emphasis on basslines - snarling leads With a pitched input, this can add motion without losing the basic note. #### FM1 ← DIST The manual says this applies the distortion output as dynamic frequency modulation. Use this carefully for: - metallic melodic lines - laser-bass sequences - aggressive pitch shimmer For melody, keep FM1 amount low. Too much will smear pitch. #### GAIN CV ← POLE 2 The manual calls this a relatively subtle form of distortion, shifting harmonic content. This is one of the most useful melodic features because it creates: - internal animation tied to the filter - harmonic movement that follows the note - a more “alive” tone without fully destroying pitch Great for: - basslines - drones with melodic contour - sustained leads #### RES CV ← DIST This introduces audio-rate modulation of resonance and can make laser sounds and screeches. For melodic use: - keep low - use as accent coloration - add only on select notes or phrases This can be very expressive but becomes chaotic quickly. --- ## Touch points as melodic performance controls The touch points are not only for noise. They expose: - **DIST 2 OUT** - **GAIN CV** - **DIST 2 AMP PIN** - **RES CV** - **DIST 1 AMP PIN** - **FREQ CV** - **DIST OUT** - another **GAIN CV** The manual describes them as **direct resistive connections** to circuit points. You can bridge them with: - fingers - patch cable tips - alligator clips - conductive materials ### Melodic uses of touch points ## 6. Manual expressive pitch bending Touching or injecting signal at **FREQ CV** can create: - vibrato - bends - squeals - expressive pitch movement This makes 100 Grit act like a playable lead instrument. ## 7. Dynamic timbral articulation Using: - **DIST OUT → GAIN CV** - **DIST 2 OUT → RES CV** - or finger-bridging adjacent output/input points you can add phrase-specific changes during a melodic performance. This is useful for: - turning sustained notes into expressive gestures - adding grit at phrase endings - making repeated notes vary naturally ## 8. Audio-rate modulation for pitched sidebands The manual notes audio into **FREQ CV**, **GAIN CV**, or **RES CV** can create distortion and AM/FM-like effects. If the source is pitched and somewhat related to the note being played, you can get: - clangorous intervals - quasi-FM melodies - harmonic enrichment This works especially well if another oscillator is patched to a touch point while pitch CV sequences the filter. --- # Practical melodic patch ideas ## Patch 1: Distorted bass voice This is the most straightforward melodic use. ### Patch - Oscillator saw/square → **IN1** - Sequencer pitch CV → oscillator 1V/oct - Same pitch CV or related CV → **FM2** - Envelope → **GAIN CV** - Listen to **OUT** first, then **DIST** ### Settings - **IN1** around 50–75% - **FREQUENCY** low to mid - **RES** around 20–40% - **GAIN** around 50–75% - **x100** off initially ### Result - solid bass articulation - resonant vowel/growl tone - controlled harmonic aggression - notes remain defined ### Why it works The oscillator provides stable pitch, while 100 Grit adds: - filtering - envelope shaping - saturation - internal harmonic animation --- ## Patch 2: Self-oscillating lead voice Use the filter itself as the sound source. ### Patch - No audio input, or very low audio input - Pitch CV/sequencer → **FM2** - Envelope → **GAIN CV** - Listen to **OUT** - Raise **RES** until near or at oscillation ### Optional - use **J9** resonance header behavior if you want more self-oscillation dominance - add slight **FM1** amount unpatched for internal distortion feedback FM ### Result - unstable but playable lead tones - sine-ish to tearing resonant voice - great for acid, industrial lead lines, eerie melodies ### Notes The manual only says **roughly track**, so expect: - character over precision - best results in narrower melodic ranges - excellent expressive imperfections --- ## Patch 3: Pinged melodic percussion This creates tuned percussive notes that can still form melodies. ### Patch - No sustained input required, or use a very short transient input - Triggered envelope → **GAIN CV** - Pitch CV → **FM2** - High **RES** - Listen to **OUT** ### Result - tuned blips - tom-like notes - wooden/plucky resonant sounds - melodic percussion lines ### Enhancement Use a little **DIST** output to add edge, but not so much that pitch disappears. --- ## Patch 4: Acid-style sequenced line 100 Grit looks especially suited for this. ### Patch - VCO saw → **IN1** - Sequencer pitch → VCO - Envelope or accent CV → **GAIN CV** - Pitch CV or envelope modulation → **FM2** - Listen to **DIST** or **OUT** ### Settings - **RES** medium-high - **FREQUENCY** fairly open - **GAIN** high enough to saturate - **x100** off or momentary on for accents ### Result - squelchy, aggressive, unstable acid lines - strong melodic contour - expressive accents through gain and resonance interaction ### Extra trick Leave **FM1** unpatched and bring it up slightly so the **DIST-normalled modulation** adds bite and movement. --- ## Patch 5: Harmonic melody shaper for an external oscillator Instead of making a voice from scratch, use 100 Grit to turn a plain melody into something animated. ### Patch - Clean VCO/submix → **IN1** - Melody from sequencer controls oscillator pitch - Envelope → **GAIN CV** - Leave **GAIN CV** normalization partially active if useful - Listen to **OUT** and/or **DIST** ### Result - melodic line stays recognizable - harmonics move internally - can go from warm to brutal without losing sequence identity This is especially effective if your source oscillator is simple, because 100 Grit can supply much of the personality. --- ## Patch 6: Manual touch-played melodic solo Use the touch points as performance controls over a sequenced note stream. ### Patch - Oscillator → **IN1** - Pitch CV → oscillator and optionally **FM2** - Envelope → **GAIN CV** - Listen to **DIST** - During playback, touch: - **DIST OUT** with **FREQ CV** - **DIST 2 OUT** with **RES CV** - adjacent output/input pairs ### Result - expressive bends - phrase-ending shrieks - manually injected timbral accents - a playable solo voice rather than static sequence This is one of the most unique melodic uses of the module. --- # Which output is better for melody: OUT or DIST? ## OUT Better for: - clearer pitch - filter-based melodic work - self-oscillation patches - basslines where note definition matters ## DIST Better for: - aggressive leads - industrial bass - harmonically dense melodic phrases - expressive destruction after the note is established A good strategy is: 1. build the melody on **OUT** 2. switch to **DIST** 3. add x100 or feedback slowly --- # Headers and their role in melodic behavior ## J9: Input to Resonance Default is **ON**. Manual says this: - maintains bass frequencies - prevents some classic resonance-related volume loss - removing it allows more whistling sounds and lets self-oscillation overtake the input ### Melodic use - **ON**: better for basslines and fuller melodic material - **OFF**: better for whistling resonant leads and self-oscillating melodic patches ## J10: Output Source Default is **VCA** If moved, **OUT** can come directly from the filter rather than post-VCA. ### Melodic use - **VCA position**: best for articulated notes with envelopes - **Filter output position**: best if you want continuous filter tone independent of GAIN, or want to use DIST and OUT as two different melodic/timbral taps --- # Best strategies for making 100 Grit musical instead of random ## 1. Start with stable pitch elsewhere The easiest way to make 100 Grit melodic is to feed it: - a tuned VCO - quantized sequence - bass drone with pitch center Then use 100 Grit for articulation and color. ## 2. Add chaos gradually Because many controls are normalized to feedback sources, it is easy to lose pitch definition. For musical use: - begin with all secondary controls fully CCW - add one modulation path at a time - monitor whether the note center remains audible ## 3. Use FM2 for pitch, FM1 for character Based on the manual, **FM2** is the better destination for external pitch tracking, while **FM1** is often useful as a character modulation lane due to its distortion normalization. ## 4. Keep distortion after pitch is established If the melody is disappearing: - lower **GAIN** - reduce **IN1** - use **OUT** instead of **DIST** - reduce **FM1** - reduce **RES CV** ## 5. Treat touch points like expressive macros Rather than using them constantly, use them for: - fills - transitions - accents - note bends at phrase ends That keeps the melodic line intelligible. --- # Best melodic roles for 100 Grit in a system The manual suggests a module that excels at these melodic jobs: ## Bass voice processor Probably one of its strongest roles: - input oscillator - sequence pitch externally - use resonance and gain for weight and aggression ## Dirty lead synth Especially with: - resonant filter - rough tracking via FM2 - touch point performance ## Resonant auxiliary voice Self-oscillation or filter ping patches can act as: - second melody line - countermelody - tuned percussion ## Performance sound design layer Even if another module provides pitch, 100 Grit can provide: - expressive harmonic movement - phrase-level distortion - live tactile interaction --- # Summary The **Schlappi 100 Grit** can create melodic components by combining its sections in a few core ways: 1. **Filter + FM2 + resonance** can act as a rough pitch-bearing voice 2. **GAIN CV** gives note articulation, making it usable like a synth voice 3. **OUT** preserves note clarity; **DIST** adds aggressive harmonic content 4. **Self-oscillation** and **filter pinging** make it capable of generating melody on its own 5. **Feedback normalizations** add animated harmonics and movement that can follow a sequence 6. **Touch points** provide highly expressive manual performance control for bends, modulation, and accents In practice, the most musical uses are: - **distorted basslines** - **acid leads** - **resonant self-oscillating melodies** - **pinged tuned percussion** - **externally pitched melodies made more alive through internal feedback and touch control** So while 100 Grit is famous for destruction, the manual makes it clear that it is also a very strong **melodic performance processor and semi-voice**, especially when used with pitch CV, envelopes, and careful control of its internal feedback paths. --- [Generated With Eurorack Processor](https://github.com/nstarke/eurorack-processor)