
Proteus Keys PK-6
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Document Library
Audio Demos
Compatible Sound ROMs

Beat Garden
A 32MB expansion sound ROM designed by sound designer Rob Papen that blends techno and dance instruments with acoustic instruments and percussion. It offers a fusion of electronic and acoustic sounds aimed at contemporary music production across multiple genres.

Definitive B-3
A 32 MB expansion sound ROM developed in collaboration with B-3 virtuoso John Novello, featuring a diverse collection of Hammond tone wheel organ drawbar settings sampled both direct and through rotary speakers (chorale and tremolo at various speeds). It contains 3 banks of 128 presets each plus 140 instrument definitions, offering extensive customization of classic B-3 organ tones. Factory demo tracks include "Swingin' B-3" and "B-3 Medley."
Ensoniq Project
A 32 MB expansion sound ROM (SIMM module) collecting sounds culled from ENSONIQ's Urban Dance Project and Real World libraries originally made for the ASR and MR keyboards and racks. E-MU sound designers reprogrammed these legendary presets for the current E-MU line, organized into 4 banks. All presets are set up to control synthesis and filter parameters via the real-time controllers found on E-MU modules, command stations, and keyboards.

Holy Grail Piano
An exceptionally detailed sampled acoustic piano created using E-mu's proprietary "Virtual Model Sampling" process, which captures individual sonic components — hammer action, pedal mechanics, and sympathetic resonance — then reassembles them for heightened realism. The ROM contains 128 presets optimized for various musical styles plus 40 raw instrumental variations. A larger CD-ROM version of the library was also offered separately through Q-Up Arts.

Orchestral Sessions Vol. 2
A 32MB expansion Sound ROM containing realistic orchestral instruments including woodwinds, brass, percussion, and solo strings, with velocity switching between p/mf/ff samples. It holds the same sound set as E-MU's Virtuoso 2000 module, including special presets for 4-speaker applications and a percussion battery of more than 20 instruments.

Orchestral Sessions Volume 1
A 32MB expansion sound ROM (SIMM) featuring realistic orchestral string sections, including legato, spiccato, pizzicato, and tremolo articulations. It contains the same sounds featured in E-MU's Virtuoso 2000 sound module, aiming for a true virtual orchestra with high realism and consistency. It is designed to pair with Orchestral Sessions Volume 2 for a complete orchestral sound set.

Peter Siedlaczek Advanced Orchestra
A 32MB expansion sound ROM (SIMM) featuring orchestral samples from sound designer Peter Siedlaczek's Advanced Orchestra collection. It contains string, brass, wind, and percussion ensembles recorded in a variety of articulation styles. It can be used on its own or as a complement to E-MU's Orchestral Sessions ROM volumes.

Protean Drums
A sound expansion ROM providing 512 drum sounds sampled by E-MU engineers from acoustic drum kits recorded in professional studios, ranging from standard bread-and-butter kits to specialized R&B, stadium rock, and jazz. Electronic drum samples and additional percussion instruments round out the set. All samples are optimized for E-MU's synthesis architecture for full control over sound and performance.

Proteus Pop Collection
A 32 MB expansion sound ROM containing 640 diverse presets across 5 banks that cover the full sonic spectrum, from traditional keyboards and orchestral instruments to electric guitars, world percussion, and drum kits. It appears in the instrument's LCD as "PROM1" (labeled PROM 1) and includes four factory demo tracks: "Tahoe Run," "Brave New World," "The Sky Club," and "Caught Up." It serves as a versatile general-purpose sound library for compatible Proteus-family hardware.

Protozoa
A 16 MB expansion ROM compiling "greatest hits" presets drawn from the original Proteus/1 (Pop/Rock), Proteus/2 (Orchestral), and Proteus/3 (World) sound modules. It also adds a bonus bank of newly designed hybrid sounds that layer instruments from all three Proteus modules together.

Pure Phatt
Pure Phatt picks up where E-MU's Planet Phatt left off, packing 32 MB of fresh hip-hop and urban sounds. The library was crafted by top producers from the East, Southeast, and West coasts and includes pumping leads and basses, silky pads, plus E-MU's signature hits, scratches, and drones. It installs as a sound SIMM (code 13, labeled/displayed as "PHATT") providing 4 banks of instruments.

Sounds of the ZR
A 32MB expansion sound ROM that reproduces the sounds of ENSONIQ's ZR-76 keyboard, headlined by William Coakley's acclaimed "Perfect Piano" alongside a broad collection of synths, orchestral instruments, and drum machine presets. It includes General MIDI presets plus new sounds derived from the original ZR-76 waveforms, organized into 4 banks (LCD display name "ZR"). Designed to expand the sonic palette of E-mu's Proteus-platform instruments.

Techno Synth Construction Yard
A 32 MB expansion SIMM developed by Dutch sound designer Rob Papen in collaboration with E-MU, focused on fresh electronica sounds for techno and dance production. It contains 4 banks of carefully constructed instruments and presets that leverage the Proteus-platform module's synthesis, effects, and filter capabilities.

Vintage Collection
A 32 MB SIMM sound ROM containing a collection of classic vintage keyboard sounds spanning the 1960s through 1980s. It features over thirty classic keyboards including tonewheel organs, suitcase pianos, and analog and digital synthesizers, organized across 4 banks. The instruments are designed to be played and shaped via real-time controllers on E-MU samplers and modules.

World Expedition
The World Expedition sound set consists primarily of ethnic instruments and percussion collected from around the world. It spans global wind instruments, plucked and bowed strings, and a wide range of world drums and percussion kits organized across multiple banks. The ROM ships as a SIMM expansion accompanied by a Modules Upgrade CD for installing the necessary software updates.

X-Lead
The X-Lead is a 32MB expansion sound set (SIMM ROM) consisting primarily of analog, noise, and modern synthesizer waveforms rich in harmonic texture, designed to pair with the Z-plane filters in Proteus sound modules. It is the ROM/SIMM version of the Xtreme Lead-1 sound bank and adds dynamic and rhythmic content accessible via an included software upgrade and the module's controller knobs.
X-Lead V2
A 32 MB expansion sound ROM (SIMM) for the E-MU Proteus/Audity family. The X-Lead V2 sound set consists primarily of analog, noise, and modern synthesizer waveforms taken from the XK-6 Xtreme Lead-1 keyboard, offering synth soundscapes, dance kits, arpeggiators, and SuperBEATs. It provides 5 banks totaling roughly 640 presets plus numerous instruments, with built-in arpeggiator patterns and beat content aimed at dance and electronic production.
Parts & Components
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Factory Sound Library
Modifications
Owner Registry
Production figures for the Proteus Keys PK-6 were never widely published, so there’s no official record of how many were built — or how many survive. This registry is a community census: every owner who logs their unit makes it the closest thing there is to a real count.
Serial number, condition, and configuration are aggregated anonymously into the census.
System Components
Manufacturer
E-MU Systems
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Specifications
- midi
- 3
- filter
- 50 Z-Plane
- presets
- 1152 (512 RAM, 640 ROM)
- keyboard
- 61
- rom size
- 32MB
- polyphony
- 64 Voices
- audio outs
- 4
- interfaces
- 2 Foot Switch Ports
- instruments
- 1173
- digital outs
- No
- midi channels
- 16
- sampling rate
- 44.1kHz
- expansion roms
- Proteus Pop Collection
- sampling depth
- 16-bit






