Behringer 921 VC Oscillator

Behringer 921 VC Oscillator; Eurorack module; analog oscillator with 6 waveforms (sine, triangle, ramp, sawtooth, square and pulse); tuning range: 6 octaves; fine-tune control; switchable LFO mode; PWM with 2 CV inputs; Hard-Sync with adjustable phase and 2 trigger inputs; 3 pitch-CV inputs (1V/oct.); Aux output with independently selectable waveform; power consumption: 50mA (+12V) / 50mA (-12V); width: 14 HP; depth: 45mm

Further Information

Analog Yes
Digital No
Width 14 TE / HP
variants Behringer

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14 Customer Ratings:
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4.3 /5
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Useless output levels (1/10th of normal eurorack levels)
Andvarc, 04.11.2020
I bought this for use in my modular synth. On the surface it is a great oscillator for a bargain price. However, there is a caveat: The main waveform output levels are next to useless.

Raeson: The 4 main oscillators output levels are only -4dBu (0.48V rms). That is roughly equal to consumer level audio output (only 1/10th of normal eurorack levels). The aux output has a variable level and can output up to +/- 5V or rougly +16 dBu which is fine.

The low output level for the main waveforms means that you need to amplify these outputs by 20db to use them in your eurorack where 5V is the standard.
In practice what happens is that when using this module together with other oscillators and modules that output +/- 5V - the signal from the 921 is completely drowned out (unless they are amplified first - which is downright silly). Hence the only part of the oscillator you can really use is the aux output.

Ultimately I found this unacceptable and a waste of precious rack space and have returned the module. I am very sorry about that, because I loved the concept. Behringer: please fix this stupid design flaw.
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A Quality Moog Oscillator
Squirrel70, 19.10.2020
This is a very good sounding Oscillator very near to Moog sounding. The above reviewer wildthing noted about the centre frequency not being tuned to C when set a zero. Original Moog oscillators are tuned to 640Hz (E5), 160Hz (E3) and 2.560KHz (E8) respectively, this was Moog's tuning, so not all Oscillators are tuned to C. If you want to tune it to C then set it to -2 on the frequency dial or thereabouts. It may very between 921's depending on how they were set at Behringer's factory.

The 921 VCO is very stable after an hour's warmup, in fact much more stable than the 921B which will begin to drift eventually and require retuning a few times.
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Good but not the Best
Pete81, 08.11.2020
I like this oscillator and for the price you cant really complain. I find the tuning needs tweaking each time I turn my rack on (not something that I've needed to do with my more expensive oscillators) but its a third of the price and it only takes two seconds to tune. The build quality also feels cheaper than my other oscillators, but you get what you pay for. If you cant afford a £250 oscillator, then this is a perfect option.
Its nice to have the Aux outputs and allows you to route many sounds from just one oscillator.
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nice clone
Wildthing, 29.06.2020
I've never owned a real 921 so can't tell about a/b comparison. It sounds good. The frequency pot is not settle on C in 0 position so it you want to tune it to C you have to go to -2. I've tried to use trimmers on the back to bring C to 0 without getting solution. Probably this is a feature of the original one but it doesn't come handly. The aux output has a hot level that is useful if you want to saturate filters.
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Show variations of this product
Behringer 921 VC Oscillator
(14)
Behringer 921 VC Oscillator

Behringer 921 VC Oscillator; Eurorack module; analog oscillator with 6 waveforms (sine, triangle, ramp, sawtooth, square and pulse); tuning range: 6 octaves; fine-tune control; switchable LFO mode;...

  • Analog: Yes
  • Digital: No
  • Width: 14 TE / HP
  • variants: Behringer
Behringer 921B
(6)
Behringer 921B

Behringer 921B Oscillator; Eurorack module; analog VCO / LFO; octave switch and fine-tuning control; individual outputs for sine, triangle, sawtooth and square/pulse waveforms; hard- and soft-sync...

  • Analog: Yes
  • Digital: No
  • Width: 8 TE / HP
  • variants: Behringer
Behringer 112 Dual VCO
(9)
Behringer 112 Dual VCO

Behringer 112 Dual VCO; Eurorack module; two identical analog VCOs in one module; selectable waveforms: triangle, sawtooth and squarewave/pulse; adjustable pulsewidth and PWM CV input with...

  • Analog: Yes
  • Digital: No
  • Width: 16 TE / HP
  • variants: Behringer
$110 €92.24
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