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Quick Start Guide

OSCILLATOR MODULE 1004

Legendary 2500 Series Dual Core VCO 
Module for Eurorack

Controls 

(1) 

COARSE FREQUENCY

 – Sets the frequency from 0.03 to 

32 Hz in the low (LFO) range, or from 15.5 Hz to 16 kHz in 
the high (audio) range, depending on the Fine frequency 
knob setting. 

(2) 

FINE FREQUENCY

 – Adjusts the frequency by a factor of 

±1 octave, potentially halving or doubling the frequency 
at either extreme. 

(3) 

ENABLE switch

 – Turns the oscillator on and off. 

(4) 

RANGE switch

 – Determines whether the oscillator 

operates in the low (subsonic/LFO) band or the high 
(audio) band. 

(5) 

WAVEFORM switches

 – Engage up to 5 waveforms by 

moving the relevant toggle switch to the left, or engage 
the inverse waveform by moving the switch to the right. 
The center position turns the waveform off. Engaging 
multiple switches simultaneously produces the average of 
all active waveforms. 

(6) 

PW knob

 – Manually control the pulse width for the 

pulse waveform. 

(7) 

FM 2 knob

 – Attenuates the signal connected to the FM 

2 input. 

(8) 

PWM knob

 – Adjusts the modulation depth of the PMW 

control input. 

(9) 

FM 1 knob

 – Attenuates the signal connected to the FM 

1 input.

(10) 

KYBD

 – Connect a keyboard or other external frequency 

control via 3.5 mm TS cable. 

(11) 

FM 1/2

 – Connect external voltages to modulate 

the frequency. 

(12) 

PWM

 – Connect an external voltage to modulate the 

pulse width. 

(13) 

OUT 

– Send the oscillator signal to other modules via 

3.5 mm TS cable. 

Power Connection

The unit comes with the required power cable for connecting 
to a standard Eurorack power supply system. Follow these 
steps to connect power to the module. It is easier to make 
these connections before the module has been mounted into 
a rack case. 

1. 

Turn the power supply or rack case power off and 
disconnect the power cable.

2. 

Insert the 16-pin connector on the power cable into the 
socket on the power supply or rack case. The connector has 
a tab that will align with the gap in the socket, so it cannot 
be inserted incorrectly. If the power supply does not have 
a keyed socket, be sure to orient pin 1 (-12 V) with the red 
stripe on the cable.

3. 

Insert the 10-pin connector into the socket on the back of 
the module. The connector has a tab that will align with the 
socket for correct orientation.

4. 

After both ends of the power cable have been securely 
attached, you may mount the module in a case and turn on 
the power supply.

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V 1.0

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