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Quick Start Guide

MODAMP MODULE 1005

Legendary 2500 Series Ring Modulator 

and VCA Module for Eurorack

Controls 

(1) 

AMPLIFIER GAIN

 – This knob controls the VCA’s gain and 

final output volume at the OUT jack.

(2) 

UNMOD GAIN

 – This knob controls the IN A signal gain 

when the module is in UNMOD mode (as indicated by the 

UNMOD button). UNMOD mode allows the module to be 

used as a VCA when modulation is not required.

(3) 

AMPLIFIER CONTROL MODE (EXP’L/LINEAR

) – 

This sliding switch determines whether the VCA gain 

response is exponential (EXP’L) or linear (LINEAR).

(4) 

UNMOD

 – Press this button to place the module into 

UNMOD mode. In UNMOD mode, the IN A signal passes to 

the OUT jack without any modulation, and the signal level 

is controlled by both the UNMOD GAIN and AMPLIFIER 

GAIN knobs. IN B does not function in UNMOD mode.

(5) 

MOD

 – Press the button to activate MOD mode. In MOD 

mode, the circuit combines the IN A signal and the IN B 

signal to produce an output signal that is a modulated 

combination of the two input signals.

(6) 

RATIO

 – Use this knob in MOD mode to offset the tune 

control voltage that is sent out through the CV B jack. 

This function only operates when MOD mode is selected.

(7) 

TUNE

 – Use this knob in MOD mode to control the output 

level of the tune control voltage sent out through both 

the CV A and CV B jacks. This function only operates when 

MOD mode is selected.

(8) 

IN A

 – This knob controls the input level for the signal 

coming in through the IN A jack.

(9) 

IN B

 – This knob controls the input level for the signal 

coming in through the IN B jack.

(10) 

IN A / IN B

 – Use these input jacks to route in audio 

signals for the internal modulation process via cables with 

3.5 mm connectors.

(11) 

CV A / CV B

 – Use these jacks to route TUNE (CV A and 

CV B) and RATIO (CV B offset) control voltages out to the 

two VCOs that typically supply the audio signals to the IN A 

and IN B inputs to be modulated.

(12) 

CV IN

 – Use this jack to route in control voltage signals for 

remote control of the AMPLIFIER GAIN setting.

(13) 

MOD

 – Use this jack to route in a trigger signal to remotely 

activate MOD mode via a cable with 3.5 mm connectors.

(14) 

GATE

 – Use this input jack to route in a gate signal to 

turn the modulation circuit on and off via a cable with 

3.5 mm connectors.

(15) 

UNMOD

 – Use this jack to route in a trigger signal to 

remotely switch off MOD mode via a cable with 3.5 mm 

connectors        .

(16) 

OUT

 – This jack sends out the final VCA signal via cable 

with 3.5 mm connectors.

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(3)

(4)

(5)

(6)
(7)

(8)

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(14) (15) (16)

V 1.0

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