EL
Works best for modulation
The Behringer 921 VC Oscillator is an accurate clone of the original Moog unit. Having used this module extensively, we've realized that it makes the most sense if used with the other Moog components. If you plug it into a typical Eurorack system, several things will probably confuse you at first.
- The switchable output comes with a switchable wave shape and a large volume knob, but also with an inverted output. This suggests that you are supposed to use it as an LFO, and use the inverted output to get saw and ramp. It will track with semitones, but it works a lot better in wide mode, where you can go to very slow up into audio rate, and can be used as modulation for very cosmic tones.
- The four waveform outputs along the bottom are much quieter than typical Eurorack level, but can be mixed together with the CP4 mixer (which also saturates). On the similar Moog 901 VCO, these outputs also had individual attenuation.
- Like the original Moog, the oscillator is tuned to F. The user should be ready to calibrate the tuning via trim pots on the back (see instructions in the manual, which is also online if it's not in the box)
- The oscillator tracks over a 5 octave range. Some of the waveforms like the sinus and triangle will lose their character at audio rate if you go too low. Also, the oscillator stops tracking pitch at 0 V, i.e. there is a minimum pitch when using this with CV.
- Pulse width ("rectangular width" here) only goes from 15% to 85% via the knob, but the full range of 0% .. 100% can be had using CV.
- "Clamping Point" is normally called Sync.
To better understand how the Moog modular is supposed to work, look up Daniel Fisher's Moog Model 10 videos. Also helpful is the AM Synths webpage about this module, which goes into much greater detail about this module's technical characteristics, voltages, et cetera!
- The switchable output comes with a switchable wave shape and a large volume knob, but also with an inverted output. This suggests that you are supposed to use it as an LFO, and use the inverted output to get saw and ramp. It will track with semitones, but it works a lot better in wide mode, where you can go to very slow up into audio rate, and can be used as modulation for very cosmic tones.
- The four waveform outputs along the bottom are much quieter than typical Eurorack level, but can be mixed together with the CP4 mixer (which also saturates). On the similar Moog 901 VCO, these outputs also had individual attenuation.
- Like the original Moog, the oscillator is tuned to F. The user should be ready to calibrate the tuning via trim pots on the back (see instructions in the manual, which is also online if it's not in the box)
- The oscillator tracks over a 5 octave range. Some of the waveforms like the sinus and triangle will lose their character at audio rate if you go too low. Also, the oscillator stops tracking pitch at 0 V, i.e. there is a minimum pitch when using this with CV.
- Pulse width ("rectangular width" here) only goes from 15% to 85% via the knob, but the full range of 0% .. 100% can be had using CV.
- "Clamping Point" is normally called Sync.
To better understand how the Moog modular is supposed to work, look up Daniel Fisher's Moog Model 10 videos. Also helpful is the AM Synths webpage about this module, which goes into much greater detail about this module's technical characteristics, voltages, et cetera!
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MS
My first piece of the legend
This was my first, ever, eurorack module. I've connected it to Behringer Crave as an additional VCO.
I was surprised by the quality of the module (the knobs and the whole unit). The sound is really nice and it's a great addition to Crave. The only thing I didn't know before is that the main outputs are lower level and need mixer/amplifier. That's not an issue as I can (and will) add the mixer. I'm thinking about another module and (of course) it will be Behringer and via Thomann (great service and express delivery).
Pros:
- build quality
- sound
- price
- aux oscillator
Cons:
- low level of the main outputs
I was surprised by the quality of the module (the knobs and the whole unit). The sound is really nice and it's a great addition to Crave. The only thing I didn't know before is that the main outputs are lower level and need mixer/amplifier. That's not an issue as I can (and will) add the mixer. I'm thinking about another module and (of course) it will be Behringer and via Thomann (great service and express delivery).
Pros:
- build quality
- sound
- price
- aux oscillator
Cons:
- low level of the main outputs
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S
A Quality Moog Oscillator
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.
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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