VM2500 Dual Oscillator Module 1023

CP3 Console Panel Mixer

VM2500 Blank Panel Module 1001 VM2500 Dual Envelope Generator Module 1003 VM2500 Oscillator Module 1004-P VM2500 Oscillator Module 1004-R VM2500 Oscillator Module 1004-T VM2500 Modamp Module 1005 VM2500 Filtamp Module 1006 VM2500 Dual Noise/Random Voltage Generator Module 1016 VM2500 Oscilloscope Module 1019 VM2500 Dual Oscillator Module 1023 VM2500 Dual Reverberator Module 1025 VM2500 Preset Voltage Module 1026 VM2500 Clocked Sequential Control Module 1027 VM2500 Dual Envelope Generator Module 1033 VM2500 Sample & Hold Module 1036 VM2500 Triple VCA Module 1042 VM2500 Synthesizer Voice Module 1045 VM2500 Quad Envelope Generator Module 1046 VM2500 Multimode Filter Resonator Module 1047 VM2500 Mix-Sequencer Module 1050 VM2500 Dual Four-Channel Mixer Module 1051 VM1630 Frequency Shifter VM901 Voltage Controlled Oscillator VM901ABBB Voltage Controlled Oscillator VM902 Amplifier VM903 Random Signal Generator VM904A/B/C Filters VM905 Reverb VM907A Fixed Filter Bank VM911 Envelope Generator VM911-A Dual Trigger Delay VM912 Envelope Follower VM914 Fixed Filter Bank VM921 Voltage Controlled Oscillator VM921ABBB Oscillator Bank VM923 Filters/Noise VM927 Multiple VM928 Sample Hold VM958 Keyboard/VCO Interface VM960 Sequencer VM962 Sequential Switch VM984 Four-Channel Matrix Mixer VM995 Attenuators VM Miniverse A-440 VM Miniverse Contour VM Miniverse Filter VM Miniverse Glide VM Miniverse Mixer VM Miniverse Noise VM Miniverse Oscillator VM Miniverse Poly Contour VM Miniverse Poly Filter VM Miniverse Poly Glide VM Miniverse Poly Mixer VM Miniverse Poly Oscillator VM Miniverse Poly VCA VM Miniverse VCA VM Rackmode 10 Band Graphic EQ VM Rackmode 12 Stage Phaser VM Rackmode 3 Band Parametric EQ VM Rackmode Frequency Shifter VM Rackmode Poly Vocal Source Oscillator VM Rackmode Ring Modulator VM Rackmode String Filter VM Rackmode Vocal Source Oscillator VM Rackmode 16 Channel Vocoder

VM958 Keyboard/VCO Interface VM960 Sequencer VM962 Sequential Switch

VM912 Envelope Follower VM928 Sample Hold VM Miniverse Glide VM Miniverse Poly Glide VM Miniverse Poly VCA VM Miniverse VCA

VM2500 Dual Reverberator Module 1025 VM1630 Frequency Shifter VM905 Reverb

VM2500 Dual Envelope Generator Module 1003 VM2500 Dual Envelope Generator Module 1033 VM2500 Quad Envelope Generator Module 1046 VM911 Envelope Generator VM Miniverse Contour VM Miniverse Poly Contour

VM2500 Filtamp Module 1006 VM2500 Multimode Filter Resonator Module 1047 VM904A/B/C Filters VM907A Fixed Filter Bank VM914 Fixed Filter Bank VM Miniverse Filter VM Miniverse Poly Filter VM Rackmode 12 Stage Phaser VM Rackmode 16 Channel Vocoder

VM2500 Synthesizer Voice Module 1045

VM2500 Oscilloscope Module 1019

VM2500 Dual Four-Channel Mixer Module 1051 CP3 Console Panel Mixer

VM2500 Oscillator Module 1004-P VM2500 Oscillator Module 1004-R VM2500 Oscillator Module 1004-T VM2500 Dual Noise/Random Voltage Generator Module 1016 VM2500 Dual Oscillator Module 1023 VM901 Voltage Controlled Oscillator VM901ABBB Voltage Controlled Oscillator VM921 Voltage Controlled Oscillator VM921ABBB Oscillator Bank

VM2500 Modamp Module 1005 VM2500 Sample & Hold Module 1036 VM911-A Dual Trigger Delay VM Rackmode 10 Band Graphic EQ VM Rackmode 3 Band Parametric EQ VM Rackmode Frequency Shifter VM Rackmode Ring Modulator VM Rackmode String Filter

VM2500 Preset Voltage Module 1026 VM2500 Clocked Sequential Control Module 1027 VM2500 Mix-Sequencer Module 1050

VM903 Random Signal Generator VM923 Filters/Noise VM Miniverse A-440 VM Miniverse Noise VM Miniverse Oscillator VM Miniverse Poly Oscillator VM Rackmode Poly Vocal Source Oscillator VM Rackmode Vocal Source Oscillator

VM2500 Blank Panel Module 1001 VM2500 Triple VCA Module 1042 VM902 Amplifier VM927 Multiple VM984 Four-Channel Matrix Mixer VM995 Attenuators VM Miniverse Mixer VM Miniverse Poly Mixer

The 1023 Dual Oscillator contains two independent, full-function oscillator modules. It's essentially the same as two of the 1004-style oscillators in one module, less the pulse-width modulation CV inputs. These can be used in the audio range, or as low-frequency modulation sources. Since the controls for each side are exact duplicates, we'll go over them just once.

Inputs, Outputs, and Controls

Oscillator active lamp- The red lamps in the upper corners glow to indicate the oscillator is enabled (either side can be disabled by setting the waveform selector knob to Off).

Frequency / Coarse and Fine- The Coarse control sets the base frequency over a nine-octave range, in octave increments. The Fine control allows continuous fine pitch control and is configured as a "multiplier" with center position being nominal and a range of 1/2 pitch to the left or double the pitch to the right (i.e., +/- one octave).

Range- Generally this will be set to Low when using as a mod source, or high for audio-range signals.

1V/Oct jack- Accepts a CV input for pitch. Typically this would come from the Pitch jack in the IO Panel CV Out section, or from a sequencer CV out.

Pulse Width (PW)- This sets the width or "duty-cycle" of the pulse wave (the very bottom waveform on the panel). It has no effect on any other waveform. Its default setting of 50% outputs a perfect square wave, rich in odd-order harmonics. Moving the knob left or right narrows its width as well as the thickness of sound until it almost disappears at its extremes.

Output a/b wave selector- Selects off, sine, triangle, square, ramp, or pulse wave output. The red lamp in the upper corner dims in Off position.

Frequency Mod 1 and 2 input jack and attenuator- This is used for externally modulating the oscillator frequency. It's useful for adding vibrato with an LFO, siren noises, envelope-controlled pitch sweeps, etc. The attenuator knob is bipolar; it allow positive (turn right) or inverted voltage control (turn left). It defaults to center zero position.

All mod inputs are exponential, that is for a given mod input voltage, the mod amount increases as frequency increases. For example, if the base frequency is 1000 Hz, and a bipolar wave is applied to the mod CV input, the frequency falls to 500 Hz and rises to 2000 Hz. Because audio frequencies are inherently exponential in nature, the resulting frequency rises and falls exactly one octave.

Output a/b jacks- Audio output of oscillator waveforms.