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Museum : ARP Room : 2500 : ARP 2500 Modules

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. ARP Instruments
16-Voice Electric Piano
4-Voice Electric Piano
Explorer 1
Little Brother
MSL (Educational keyboard)
Pro Soloist
CBS/Rhodes Chroma
Solina String Ensemble
Solina String Synthesizer

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ARP 2500 Modules

Type of Module Description
1002 power supply
1003 dual envelope generator This module contains two ADSR envelope generators (actually labeled "Attack", "Initial Decay", "Sustain", and "Final Decay"), each switchable between single or multiple triggering. There is a manual gate button as well as a front panel input for gate/trigger and a back panel input for a sustain pedal.
1003a dual envelope generator (same as 1003, except re-positioned trigger switches and gate buttons)
1004 VCO A Voltage Controlled Oscillator with a range from 0.03Hz to 16kHz, this module can function as a VCO or an LFO. It features separate outputs for each of its five waveforms (sine, triangle, square, sawtooth, and pulse) and 6 CV (control voltage) inputs, as well as a CV input for Pulse Width Modulation.
1004p VCO This module is the same as the 1004, except each waveform has its own attenuation knob for mixing all the waveforms together. There is a separate output to for the mixed waveforms.
1004r VCO This module is the same as the 1004, except each waveform has its own rocker switch to route any or all of the waveforms to an extra mix output.
1004t VCO This module is the same as the 1004r, except it uses toggle switches.
1005 VCA and
Ring Modulator
This module is half Voltage Controlled Amplifier and half Balanced (Ring) Modulator. It is switchable between linear or exponential voltage control, and features 11 inputs, 3 outputs, and illuminated push-buttons.
1006 VCF and VCA The Voltage Controlled Filter (24dB/octave, low-pass, with resonance) and Voltage Controlled Amplifier (switchable between linear and exponential) in one module
1012 Convenience Module This module routes two jack inputs to any of the upper ten lines of the lower matrix. (Remember, most of the patching for this instrument is done from these matrix sliders).
1016 dual noise generators This module features two random voltage generators outputting white or pink noise and two slow sample-and-hold circuits, four outputs in all.
1023 dual VCO Both oscillators feature the same waveforms as 1004 with a switch for high and low frequency ranges. There are a total of 10 control inputs and 2 audio outputs.
1026 Preset Voltage module This module contains eight manually or sequencer-driven gated control-voltages, each with two knobs sending control voltages to separate outputs. It can be connected, via the rear panel, to module 1027 Sequencer or module 1050 Mix-Sequencer.
1027 Sequencer This is a 10X3 sequencer with 14 outputs (including 10 separate position/step gates), 6 inputs, buttons for step and reset, and a knobs for pulse repetition/width, which controls the silence between the steps.
1033 Dual Delayed-Trigger Envelope Generator This module is the same as the 1003 ADSR module except it has two more knobs to control gate delay.
1036 Sample-and-Hold / random voltage
1045 Voice Module This all-in-one module contains a VCO, VCF, VCA, and two ADSR envelope generators, as well as 16 inputs, and four outputs. (Note: Most modules feature a spelling mistake "Resanance" instead of "Resonance".)
1046 quad envelope generator This module is basically a 1003 and a 1033 combined into one module.
1047 Multimode Filter / Resonator This module features 15 inputs, 4 outputs and an overload warning light.
1050 Mix-Sequencer This module features two 4X1 mixers with illuminated on/off buttons.
3001 Keyboard This keyboard features a 5-octave, 61-note (C-C) keyboard with the bottom two octaves (C-B) reverse colored to show the keyboard split. The top half of the keyboard is duophonic. There are separate CV (1v/octave), gate, and trigger outputs for each side of the split, as well as separate panels on either side of the keyboard with controls for portamento, tuning, and pitch interval.
? Dual-Manual Keyboard Two 3001s, one on top of the other, with the bottom octave (C-B) or two octaves (C-B) of the top keyboard reverse colored to show the split.

[from The A-Z of Analogue Synthesizers, by Peter Forrest, published by Susurreal Publishing, Devon, England, copyright 1994 Peter Forrest]

Also: 2500, another ARP 2500, ARP 2500 brochure
(courtesy of Kevin Lightner)

Back to main 2500 page

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