Drumlogue Units
synth v1.0.0

Pepege-Synth

2-voice polyphonic PPG wavetable synthesizer

Pepege-Synth

2-Voice Polyphonic PPG Wavetable Synthesizer

Pepege-Synth brings authentic PPG wavetable synthesis to the Korg drumlogue with 2-voice polyphony, dual oscillators, and comprehensive modulation capabilities. Inspired by VAST Dynamics Vaporizer2 and using wavetable techniques from Mutable Instruments Plaits.

Features

🎹 2-Voice Polyphony

  • Play chords and harmonies
  • Round-robin voice allocation
  • Oldest-note stealing when all voices are active
  • Smooth envelope transitions

🌊 Dual PPG Wavetable Oscillators

  • 16 wavetable banks with 256 total waves
  • Independent controls for each oscillator
  • Three PPG interpolation modes:
    • HiFi: Bilinear interpolation (smoothest)
    • LoFi: Sample interpolation only (stepped waves)
    • Raw: No interpolation (authentic PPG crunch)
  • Morphable wavetable position for evolving timbres

🎚️ Wavetable Banks

Bank Description
UPPER Classic PPG upper harmonics
RESNT1/2 Resonant waveforms
MELLOW Warm, soft timbres
BRIGHT Cutting, bright sounds
HARSH Aggressive, edgy waves
CLIPPR Clipped/distorted textures
SYNC Sync-style waveforms
PWM Pulse width modulation
VOCAL1/2 Formant-like vowels
ORGAN Harmonic organ tones
BELL Metallic bell sounds
ALIEN Strange experimental waves
NOISE Noise-based textures
SPECAL Special FX waves

🔊 State Variable Filter

  • Four filter types: LP12, LP24, HP12, BP12
  • Resonance control
  • Dedicated ADSR envelope with bipolar amount
  • Key tracking (0-100%)
  • LFO modulation (±100%)
  • Velocity sensitivity (0-100%)

📊 Dual ADSR Envelopes

  • Amp Envelope: Controls voice amplitude
  • Filter Envelope: Modulates filter cutoff
  • Independent Attack, Decay, Sustain, Release controls
  • Smooth exponential curves

🔄 Global LFO

  • Six shapes: Sine, Triangle, Saw Up, Saw Down, Square, Sample & Hold
  • Assignable to:
    • Wavetable morph position (±100%)
    • Filter cutoff (±100%)
  • Adjustable rate (0.05Hz - 20Hz)

🎛️ MOD HUB

Centralized modulation routing with 8 destinations:

  1. LFO Speed: 0-127 (maps to 0.05-20Hz)
  2. LFO Shape: Sine, Tri, Saw+, Saw-, Square, S&H
  3. LFO → Morph: ±100% wavetable position modulation
  4. LFO → Filter: ±100% cutoff modulation
  5. Velocity → Filter: 0-100% velocity sensitivity
  6. Key Tracking: 0-100% (center at middle C)
  7. Osc B Detune: ±32 cents
  8. Pitch Bend Range: ±2, ±7, ±12, or ±24 semitones

🎵 6 Factory Presets

  • Glass Keys: Bright bell-like plucks with LFO morph
  • Dust Pad: Atmospheric evolving pad with resonance
  • Sync Bass: Aggressive sync lead with detune
  • Noise Sweep: Sweeping noise FX with high-pass filter
  • Pluck: Short percussive plucks with fast attack
  • PWM Lead: Classic pulse lead with modulation

Parameters

Page 1: Oscillator A

| Parameter | Range | Description | |———–|——-|————-| | A BANK | 0-15 | Wavetable bank selection | | A MORPH | 0-127 | Wave position/morphing | | A OCT | -3 to +3 | Octave transpose | | A TUNE | -64 to +63 | Fine tuning (cents) |

Page 2: Oscillator B

| Parameter | Range | Description | |———–|——-|————-| | B BANK | 0-15 | Wavetable bank selection | | B MORPH | 0-127 | Wave position/morphing | | B OCT | -3 to +3 | Octave transpose | | OSC MOD | 0-2 | PPG mode (HiFi/LoFi/Raw) |

Page 3: Filter

| Parameter | Range | Description | |———–|——-|————-| | CUTOFF | 0-127 | Filter cutoff frequency | | RESO | 0-127 | Filter resonance/Q | | FLT ENV | 0-127 | Filter envelope amount (bipolar) | | FLT TYPE | 0-3 | LP12/LP24/HP12/BP12 |

Page 4: Amp Envelope

| Parameter | Range | Description | |———–|——-|————-| | ATTACK | 0-127 | Envelope attack time | | DECAY | 0-127 | Envelope decay time | | SUSTAIN | 0-127 | Envelope sustain level | | RELEASE | 0-127 | Envelope release time |

Page 5: Filter Envelope

| Parameter | Range | Description | |———–|——-|————-| | F.ATTACK | 0-127 | Filter attack time | | F.DECAY | 0-127 | Filter decay time | | F.SUSTAIN | 0-127 | Filter sustain level | | F.RELEASE | 0-127 | Filter release time |

Page 6: MOD HUB & Output

| Parameter | Range | Description | |———–|——-|————-| | MOD SEL | 0-7 | Select modulation destination | | MOD VAL | 0-127 | Value for selected destination | | OSC MIX | -64 to +63 | A/B oscillator balance | | SPACE | -64 to +63 | Stereo width |

Sound Design Tips

🎨 Creating Classic PPG Sounds

Glass Pads:

  1. Set both oscillators to BRIGHT or BELL banks
  2. Detune Osc B by +10 cents
  3. Set OSC MODE to HiFi for smooth sound
  4. Add LFO to morph for movement
  5. Use long attack/release times

Digital Basses:

  1. Choose SYNC or CLIPPR banks
  2. Set OSC MODE to Raw for grit
  3. Short envelope (attack=5, decay=40, sustain=70, release=25)
  4. Add key tracking for brightness
  5. Use LP24 filter with moderate resonance

Evolving Textures:

  1. Use different banks for Osc A and B (e.g., VOCAL1 + ALIEN)
  2. Set slow LFO to morph (rate=30, depth=±80%)
  3. Add LFO to filter (±40%)
  4. Long envelopes with high sustain
  5. Experiment with LoFi mode for character

Percussive Plucks:

  1. BELL or ORGAN banks
  2. Fast attack (0-5), short decay (20-40), low sustain (20-40)
  3. Filter envelope with negative amount for brightness decay
  4. High key tracking (80-100%)
  5. OSC MODE: HiFi

🎛️ MOD HUB Workflow

The MOD HUB provides a centralized way to manage modulation:

  1. Turn MOD SEL to choose a destination (e.g., “LFO>MRP”)
  2. Adjust MOD VAL to set the amount
  3. Display shows the current value (rate, %, cents, etc.)
  4. All 8 destinations remain active simultaneously

Common Routings:

  • LFO>MRP + LFO>FLT: Organic movement on both timbre and tone
  • VEL>FLT + KEY TRK: Dynamic brightness that responds to playing
  • B DETUNE + OSC MIX: Subtle chorus/ensemble effect

Installation

  1. Download the latest .drmlgunit file from the Releases page
  2. Connect your Korg drumlogue to your computer via USB
  3. Copy the file to Units/Synth/ on the drumlogue
  4. Safely eject and restart the drumlogue

Technical Details

  • Voices: 2-voice polyphony
  • Sample Rate: 48kHz
  • Binary Size: ~30KB
  • RAM Usage: ~1KB
  • Optimizations: NEON SIMD for stereo output stage
  • Voice Allocation: Round-robin with oldest-note stealing

Credits

  • Inspired by: VAST Dynamics Vaporizer2
  • Wavetable techniques: Mutable Instruments Plaits
  • PPG wavetable data: Mutable Instruments codebase
  • Developer: CLDM (0x434C444D)

Version History

  • v1.0.0 (December 2025): Initial release

Support