Eurorack Module
XR22 VCO FT
VCO with Ring Modulation Input and FSK (Frequency Shift Keying)
XR22 VCO FT
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Amplitude Modulation (AM) Input
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Ring modulation
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CV controllable sine/triangle volume
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Advanced waveform generation by AM
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Rgb-LED for optical control
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FSK (Frequency Shift Keying)
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Pulse and ramp generation
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Switching between two different frequency CVs
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Advanced waveform generation by FSK
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LFO-, Bass-, High- Mode
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Switchable Sync-Mode (from Rev.6)
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Width: 12 HP
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Dimensions: 128,5 mm x 60,6 mm
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Depth: 35mm
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Current: +12V: ≤103mA; -12V: ≈42mA
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Optionally available in banana version
The XR22 VCO FT is a VCO with amplitude modulation option – which can be used for volume control, or ring modulation of the oscillator’s sine/triangle output. The AM-input signal is added to a DC-voltage adjustable by knob ‘Gain’ (between ca. +/-5V) and the sum voltage is being internally multiplied with the sinewave/trianglewave The result is an oscillator amplitude depending on the ‘Gain’-DC plus AM-input signal. » read more
The applied AM-input signal can be mixed to the VCO output signal (modulated or unmodulated) too – a kind of ‘dry/wet’ control with the mix provided on the sine/triangle output. With no AM-input, the XR22 VCO FT behaves like a normal sinewave/triangle VCO, then its volume is controlled by knob ‘Gain’. Whereas with the knob ‘Gain’ in center position, the oscillator tone is becoming almost muted, and the input signal on ‘AM in’ controls the amplitude of the wave completely; thus the VCO can be used as a ring modulator.
The FSK (frequency shift keying) option provides two internally switchable different oscillator frequencies F1 and F2; each controllable by the two big-sized knobs (and their respective fine-tuning knobs and CV inputs). Switching between F1 and F2 can be done manually or by a logic signal (e.g. a gate signal) applied on input ‘FSK in‘.
Further, it is possible to use the XR22 VCO FT‘s squarewave output for FSK switching. This will result in ramp or sawtooth (on the sine/triangle output) and pulse (on the squarewave output) waveforms. The falling and rising edges of the of the sine/triangle signal and the duty-cycle of the squarewave output are independently adjustable, and/or controllable via CVs of F1 and F2.
Furthermore, there is a switch for linking F1 to F2. In this case, the ratio between F1 and F2 is remaining the same, independently from the frequency, and ensuring properly 1V/oct. CV tracking.
A switch allowes to enable ‘sync mode’: An applied trigger will restart the wave always at the same point, useful for synced LFO applications and more.
For optical control, the XR22VCO FT has a full-color LED for AM visualization and a 2-color LED for FSK control. » read less
» read more
The applied AM-input signal can be mixed to the VCO output signal (modulated or unmodulated) too – a kind of ‘dry/wet’ control with the mix provided on the sine/triangle output. With no AM-input, the XR22 VCO FT behaves like a normal sinewave/triangle VCO, then its volume is controlled by knob ‘Gain’. Whereas with the knob ‘Gain’ in center position, the oscillator tone is becoming almost muted, and the input signal on ‘AM in’ controls the amplitude of the wave completely; thus the VCO can be used as a ring modulator.
The FSK (frequency shift keying) option provides two internally switchable different oscillator frequencies F1 and F2; each controllable by the two big-sized knobs (and their respective fine-tuning knobs and CV inputs). Switching between F1 and F2 can be done manually or by a logic signal (e.g. a gate signal) applied on input ‘FSK in‘.
Further, it is possible to use the XR22 VCO FT‘s squarewave output for FSK switching. This will result in ramp or sawtooth (on the sine/triangle output) and pulse (on the squarewave output) waveforms. The falling and rising edges of the of the sine/triangle signal and the duty-cycle of the squarewave output are independently adjustable, and/or controllable via CVs of F1 and F2.
Furthermore, there is a switch for linking F1 to F2. In this case, the ratio between F1 and F2 is remaining the same, independently from the frequency, and ensuring properly 1V/oct. CV tracking.
A switch allowes to enable ‘sync mode’: An applied trigger will restart the wave always at the same point, useful for synced LFO applications and more.
For optical control, the XR22VCO FT has a full-color LED for AM visualization and a 2-color LED for FSK control.
The FSK (frequency shift keying) option provides two internally switchable different oscillator frequencies F1 and F2; each controllable by the two big-sized knobs (and their respective fine-tuning knobs and CV inputs). Switching between F1 and F2 can be done manually or by a logic signal (e.g. a gate signal) applied on input ‘FSK in‘.
Further, it is possible to use the XR22 VCO FT‘s squarewave output for FSK switching. This will result in ramp or sawtooth (on the sine/triangle output) and pulse (on the squarewave output) waveforms. The falling and rising edges of the of the sine/triangle signal and the duty-cycle of the squarewave output are independently adjustable, and/or controllable via CVs of F1 and F2.
Furthermore, there is a switch for linking F1 to F2. In this case, the ratio between F1 and F2 is remaining the same, independently from the frequency, and ensuring properly 1V/oct. CV tracking.
A switch allowes to enable ‘sync mode’: An applied trigger will restart the wave always at the same point, useful for synced LFO applications and more.
For optical control, the XR22VCO FT has a full-color LED for AM visualization and a 2-color LED for FSK control.
» read less
Side view right I
Side view right II
Side view right III
Back view
Panel drawing
Side view left II
Side view left I
Sounds
AM In: Rhythm Machine; Output: Sine/Triangle – Oscillator frequency manually controlled
AM In: Rhythm Machine; Output: Sine/Triangle – Frequency CVs in: Sequencer and LFO
AM In: Rhythm Machine; Output: Triangle with FSK (Ramp) – F2 CVin: LFO
2 XR22 VCOs cross-patched FSK In ⇔Square Out – AM In: Rhythm machine; Frequency CVs in: Sequencer
Sync Mode: 1. Cymbal with pickup ⇒ Peak+Hold ⇒ XR22VCOFT AMin; 2. Rhythm machine ⇒ Peak+Hold ⇒ Delay1022 frequency CV modulated with synced XR22VCOFT triangle; 3. Sync mode in audio range; 2 XR22VCO FTs with sequencer F CV in; 1stVCO is syncing the 2nd
Or listen on
https://soundcloud.com/cg-products/sets/xr22vco
Video
XR22 VCO FT Banana Versions
All CG-Products modules can be also manufactured equipped with banana sockets. Functions, technical specifications and dimensions (3U) are identical to those of the minijack version.
Two different color styles are available:
Model Klassik
Model Helene
Please note: Most CG-Products banana modules have no extra grounding socket. We recommend to use the PCV-2 for proper ground connection with external equipment!
About AM (Amplitude Modulation)
The triangle/sinewave output amplitude varies linearly with the control voltage applied to “AM in”. The modulation amount can be adjusted with knob ‘AM In’. Negative CV’s will cause phase inversion of the triangle/sinewave output.
Examples:
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| Ring modulation with external triangle signal | VCO volume control with external envelope signal | AM in connected to triangle/sinewave output (feedback) |
About FSK (Frequency Shift Keying)
The frequency of the XR22 VCO is controlled by two independent control sections F1 and F2 with their each independent manual frequency controls and CV inputs; either one or the other of these routes can be selected by a logic signal applied on socket “FSKin” and/or by switch “FSK”.
Examples:
a) Depending on the logic state of FSK control , either only F1 (with knobs “F1” and CVins “F1”) or only F2 (with knobs “F2” and CVins “F2”) is active
b) In the low position of switch “FSK” the FSK input is connected to the VCO’s own squarewave output and the oscillator frequency-shifts itself.
Now the oscillator produces ramp or sawtooth waves on its sine/triangle output and pulse waves on its squarewave output.
Rising and falling edges of the ramp wave and pulse/pause times of the squarewave can be independentlyand separately with knobs F1 and F2 and/or by their respective CV inputs.
c) By applying an external logic signal on input “FSK in” (with switch “FSK” in the middle position) the oscillator switches between F1 and F2
About Sync-Mode
With switch ‘Sync ↔ F2 CV 1V/Oct.’ in upper direction: ‘Sync’; socket ‘Sync/
With knob ‘Gain’ in cw position or a positive AM-CV, the sine/trianglewave oscillation will restart at its positive peak.
With knob ‘Gain’ in ccw position or a negative AM-CV, the sine/trianglewave oscillation will restart at its negative peak.
Please note: The panels of the modules are made from untreated natural aluminium, hand printed and varnished. Due to this manufacturing process, their surface may have little scratches or unregularities or may slightly differ in their color appearance.
Purchase – where to buy
Minijack Version
Banana Version ‘Klassik’
Banana Version ‘Helene’