Drumlogue Units
synth v0.1.0

Druteus Synth

E-mu Proteus/1 SF2 soundfont player with 442 factory presets

Download druteus-v0.1.0.drmlgunit

Druteus Synth

E-mu Proteus/1 SoundFont Player for Korg Drumlogue

Druteus brings the classic E-mu Proteus/1 sound library to the drumlogue via TinySoundFont. With 442 authentic factory presets from all six original ROM volumes, dual-layer voice architecture, and a full DSP effects chain, it delivers the distinctive Proteus sound in a polyphonic 16-voice synth.

Features

🎹 SF2 SoundFont Engine

  • Loads .sf2 files from Programs/ folder (up to 60 browsable)
  • TinySoundFont v0.9 with NEON-optimized float lowpass filter for 40–60% CPU savings
  • Chunked async file loading (128 KB per frame, no UI freeze)

🎛️ 442 Proteus/1 Factory Presets

  • All 6 original ROM volumes: Fresh Mix, Fusion, Textures, ProPower, Introspection, Full Spectrum
  • Browsable by original patch name (e.g., “FMstylePiano”, “WarmStrings”)

🔀 Dual-Layer Voice Engine

  • Primary + secondary instrument per patch
  • Independent tuning, volume, pan, chorus sends per layer
  • Velocity crossfade or keyboard split between layers

📊 Per-Patch Modulation

  • AHDSR envelopes per layer (attack, hold, decay, sustain, release)
  • LFO1 + LFO2 per patch with 5 waveforms
  • Patch modulation matrix with realtime routing

🎚️ Live Performance Controls

  • User LFO: 5 waveforms, 3 destinations (PITCH, VOL, BOTH)
  • Velocity curves: LINEAR, EXP, LOG, COMP, STEEP
  • Tempo-synced trance gate (1–32 steps)

🎛️ DSP Effects

  • Chorus (stereo widener) with per-patch send levels
  • Reverb (Griesinger topology) with per-patch amounts
  • State-variable filter: LP12, LP24, HP12, BP12

Parameters

Druteus has 24 parameters across 6 pages.

Page 1: Sound Source

# Name Range Description
0 SFONT 0–63 SoundFont file from Programs/
1 PATCH 0–441 Proteus/1 preset (shows name)
2 VOICES 1–16 Maximum polyphony
3 TUNE −12..+12 Global transpose (semitones)

Page 2: Pitch & Mix

# Name Range Description
4 FINETN −63..+63 Fine tuning (cents)
5 VOLUME 0–127 Master volume
6 PAN 0–127 Stereo pan (64=center)

Page 3: Layer Control

# Name Range Description
8 XFADE OFF, VEL, KEY Crossfade mode
9 LAYERS BOTH, PRI, SEC Layer mode

Page 4: Effects & Feel

# Name Range Description
12 CHORUS 0–15 Chorus mix
13 REVERB 0–127 Reverb amount
14 V.CURVE LINEAR, EXP, LOG, COMP, STEEP Velocity curve
15 TGATE OFF, 1–32 Trance gate steps

Page 5: Filter

# Name Range Description
16 CUTOFF 0–127 Filter cutoff (smoothed)
17 RES 0–127 Filter resonance (smoothed)

Page 6: LFO

# Name Range Description
20 LFO RTE 0–127 LFO rate
21 LFO AMT 0–127 LFO amount
22 LFO DST PITCH, VOL, BOTH Destination
23 LFO WAV TRI, SINE, SQR, SAW, RND Waveform

Installation

  1. Download druteus-v0.1.0.drmlgunit from the v0.1.0 release
  2. Download Proteus1_Instruments.sf2 (4.3 MB) from musical-artifacts.com
  3. Copy the .sf2 file to Programs/ on the drumlogue
  4. Copy druteus-v0.1.0.drmlgunit to Units/Synth/
  5. Safely eject and restart
  6. Select “DRUTEUS” in the Synth slot

Recommended SF2 files: Proteus1_Instruments.sf2 (4.3 MB) for the full 442-patch library.

Sound Design Tips

Dual-Layer Stacks

Set LAYERS to BOTH. Use XFADE=VEL to crossfade layers by velocity — play softly for primary, hard for secondary.

Velocity Response

Set V.CURVE to EXP for expressive dynamics, STEEP for drum/percussion patches, or LINEAR for consistent levels.

Pads & Textures

Select a preset from the Textures volume (126–187). Add slow LFO to VOL, increase REVERB and CHORUS for atmosphere.

Rhythmic Effects

Use TGATE (1–32 steps) synced to drumlogue tempo for gate patterns on sustained sounds.

Factory Presets

Volume Presets Character
Fresh Mix (3100) 1–63 Pop/rock, acoustic, drums
Fusion (3101) 64–125 Synth leads, pads, textures
Textures (3102) 126–187 Ambient, atmospheric pads
ProPower (3114) 188–249 Orchestral, cinematic
Introspection (3115) 250–311 New age, meditative
Full Spectrum (3116) 312–441 Complete range

Technical Specifications

  • Type: Polyphonic Synth
  • Engine: TinySoundFont v0.9 (SF2 playback)
  • Voices: 1–16 polyphonic (oldest-note stealing)
  • Layers: Up to 2 per voice (32 TSF channels max)
  • Filter: State-variable (LP12/24, HP12, BP12)
  • Audio: 48 kHz stereo float, 64 frame buffer
  • CPU: ~10–40% depending on voice count
  • MIDI: Velocity, pitch bend, channel pressure
  • Presets: 442 Proteus/1 factory presets (embedded)

Credits

  • TinySoundFont: Bernhard Schelling (MIT)
  • Proteus Patch Data: Extracted from EMU Proteus/1 ROMs
  • logue FS: Oleg Burdaev (dukesrg), MIT
  • Reverb: Mutable Instruments Rings
  • Developer: CLDM (0x434C444D)

Download

Download Druteus v0.1.0

File: druteus-v0.1.0.drmlgunit

Documentation

Support

Found a bug or have a feature request? Please open an issue on GitHub.