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 VM901 Voltage Controlled Oscillator VM902 Amplifier VM903 Random Signal Generator VM905 Reverb VM907A Fixed Filter Bank VM911-A Dual Trigger Delay VM912 Envelope Follower VM921 Voltage Controlled Oscillator VM923 Filters/Noise VM927 Multiple VM958 Keyboard/VCO Interface VM960 Sequencer VM962 Sequential Switch VM984 Four-Channel Matrix Mixer VM995 Attenuators VM914 Fixed Filter Bank VM928 Sample Hold VM1630 Frequency Shifter VM901ABBB Voltage Controlled Oscillator VM904A/B/C Filters VM911 Envelope Generator VM921ABBB Oscillator Bank VM Rackmode 10 Band Graphic EQ VM Rackmode 12 Stage Phaser VM Rackmode 3 Band Parametric EQ VM Rackmode Poly Vocal Source Oscillator VM Rackmode Ring Modulator VM Rackmode String Filter VM Rackmode Vocal Source Oscillator VM Rackmode Frequency Shifter VM Rackmode 16 Channel Vocoder 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

The Poly Vocal Source Oscillator is a special dual-oscillator module optimized for use with the Rackmode Vocoder module, but it can independently be used as a standard 1V/oct audio oscillator. What separates it from standard analog-style synth oscillators is its unique "glottal" waveform, which includes specialized parameters that enable it to reproduce both tonal and "air" sounds of the human vocal tract.

Other than its polyphonic pitch and gate CV input jacks and multi-voice capabilities, it's functionally identical to the standard Vocal Source Oscillator module.

Inputs, Outputs, and Controls

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

Poly Gate CV- Patch poly gate voltages here to enable oscillator output. Unlike typical VCO modules, Vocal Source Oscillator includes a gate input that needs to connected (otherwise you'd constantly hear the din of 16 voices).

Master Tune- Sets overall pitch up or down five semitones. This affects both Osc 1 and Osc 2.

Osc 1 Range- Sets oscillators 1's overall coarse pitch range in standard organ footage settings of 32', 16', 8', and 4'.

Osc 2 Detune- Sets Osc 2's pitch up or down five semitones.

Osc 2 Range- Sets oscillators 2's overall coarse pitch range in standard organ footage settings of 32', 16', 8', and 4'. The Off position disables oscillator 2 (hence the clever name).

Vibrato / Delay- Delays the onset of vibrato from 0.1 up to 5 seconds.

Vibrato / Rate- Sets the vibrato modulation rate from 2 to 18 Hz. The flashing LED indicates the current rate.

Vibrato / Depth- Sets the vibrato depth from 0 to 100% (about a whole-step).

Wave- Selects ramp, variable-width pulse, or Rackmode Vocoder's exclusive glottal wave. The glottal wave selection engages a vocal cord wave model widely used in speech synthesizers. Each cycle of the wave is divided into two sections in time referred to as the "open" and "closed" phases. When air passes the vocal cords which have been brought together to produce voiced speech or song, the cords open and close once each pitch cycle admitting a single puff of air, similar to a trumpeter's lips. 

Tone- Emphasizes bass or treble frequencies, center setting is neutral. The Tone knob affects all three waveforms.

Width- When the pulse wave is selected, this affects the pulse width, with maximum width (square) at the center setting.

When the glottal wave is selected, Width adjusts the relative time between open and closed phases, similar to the duty-cycle of the pulse wave. During the open phase, air passes through the opening between the vocal cords, so at higher settings, you'll hear a lot of "air." When the Width is at maximum, the vocal cords are open for almost all of each cycle and lots of air is used. Narrow widths (i.e. lower Width settings) are associated with holding the vocal cords in a tense manner, thus the open phase is short and you don't hear much air.

Try this yourself - speak with your throat very open and relaxed and you'll find that you will use up your air supply very quickly. When creating high voices, especially with the Formant control turned to the right, you will find that using a wide Width and some Breath dialed to taste will create a very realistic sounding voice.

If the ramp wave is selected, the Width knob is disabled and grays out .

Breath- Sets the volume of the "air" heard at higher Width settings. When the ramp or pulse wave are selected, the Breath knob is disabled.

Osc Out jacks- Separate outputs for each of the two oscillators. This is intended for use with Rackmode Vocoders stereo carrier inputs and Formant section. If the 2 output jack is unused, both oscillators are summed to the 1(2) output jack.