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Originally Posted by Remedial
And, I must ask, how'd you get all this information? Was this just experimentation on your end? If so, thanks for undertaking that headache to the benefit of the rest of us.
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Pure experimentation on my part. I replicated a couple of parameters of patches from the Virus onto another synth a while back, with them both in front of me at the same time. Obviously you can't just copy the values of settings down as they wouldn't translate correctly, so it required a type of deconstructing and calibrating method instead, and it was an interesting exercise to see how the Virus' inner engine worked.
I actually really like the way the Virus fine-detune is logarithmic. It becomes more fine and detailed the closer you get to zero, allowing for some really subtle, slow detuning effects which don't sound digital. The trade off is that the detune values don't follow a strict numerical, linear scale for obtaining exact specific detuning in cents.
I used two software tuners to take measurements (one to back up the other). Amplitube (guitar sim), and Wavelab.
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The reason I asked my original question was because I was trying to complete a patch programming tutorial that asked for oscillator 1 to be at -5 cents and oscillator 2 at +5. Guess that's impossible with the Virus.
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You can get the same result a number of ways. The easiest is simply finding the pitch difference you want, in this case you have -5cents and +5cents which is simply a difference of 10cents in total. Therefore if you pitch Osc 2 up by 10 cents, and then mix Osc 1 back, in you'll get a nearly identical result. If you isolate Osc2 on its own (by turning Osc Bal fully clockwise) you can use a tuner to see how far you need to detune Osc 2 upwards to get 10cents, and then add Osc 1 back in (by turning Osc Bal to the centre position). Admittedly you need a tuner, though.
Another messier method might be to use a static modulation source to pitch Osc1 down by 5cents, such as using LFO1 set to the Pulse waveform with the LFO Contour set to maximum (to make the Pulse waveform "on" all the time) and then use the LFO Osc1 Amount to detune Osc1 to whatever value you need in order to get -5cents (again, a tuner needed).
Or if you fancy eating up 33% extra polyphony for no reason at all, you can ignore Osc1 entirely (by turning Osc Bal fully clockwise) and use Osc 2 with Osc 3 in Slave mode. Using a tuner on just Osc2 again, a detune value of 36 gave me +5cents. When Osc3 is added in Slave mode, it will also detune negatively from Osc1 by the same amount.
Admittedly whatever you do, you will need a tuner to achieve accurate detunes directly in cents. Maybe I might map the fine-detune knob out in cents on a table at some point.
Another unintended long-winded post on the minutiae of the Virus! Hope it's legible. Time for a beer.
