The E-MU Proteus Custom has the same technical specifications of the Proteus 2000 and shipped with the sound ROMs of your choice. You pick the sound set or customize your Proteus using E4 Ultra banks on Flash.

Technical Specifications
SIMM Sockets: 4
SuperBEATS Mode: No
Polyphony: 128 Voices
MIDI Channels: 32
Filters: 50 Z-Plane
FX: 76
MIDI Ports: 5
Audio Outs: 6
Digital Outs: S/PDIF

E-MU Proteus 2000 Operation Manual Rev. E
E-MU Proteus 2000 v1.10 Addendum
E-MU Proteus 2000 Data Sheet
Proteus Family SysEx 2.2 Specification

Proteus Version 2.26 OS Upgrade (128-Voice)
E-Loader Version 1.1 (PC)
E-Loader Version 1.1 (Mac)
E-Loader Operation Manual

This procedure destroys any presets stored in RAM.

1. Hold both Cursor (< >) buttons down and power on the unit.
2. Once booted up into the Diagnostics menu, turn the Data Wheel knob to Initialize User Data.
3. Press the Home/Enter button.
4. Press Home/Enter again to confirm.
5. Turn the unit off, wait a few seconds and turn the unit on.