Analogue generator question

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El Nino
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Analogue generator question

Post by El Nino » Wed Jun 11, 2014 2:56 am

What values in the frequency 2 slider of the analogue generator are exact octaves of the original frequency?

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monoben
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Re: Analogue generator question

Post by monoben » Wed Jun 11, 2014 9:05 am

1770 (7148) or there about is an octave up and 230 (eb9) is one down. Just used my guitar tuner on it :D

El Nino
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Re: Analogue generator question

Post by El Nino » Thu Jun 12, 2014 3:41 am

Thanks monoben, much appreciated that you took the time to check that with your tuner.

I feel like some guitar tuners can be a little bit out for tuning synths sometimes though...(lgpt guitar tuner experiences)

To me, 7000 and 2000 sound like octaves of the original frequency but im wondering what the exact, precise values are now...nightradio?

spanjerberg
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Re: Analogue generator question

Post by spanjerberg » Fri Jun 13, 2014 10:14 pm

If you set up an anolog generator module with the visualizer oscilloscope on 'bars', you can see the wave pattern. It should remain still if it's a perfect octave. Otherwise, the peaks 'wiggle' up and down.

I found 232 (eda) as the value for the octave under (check 233 and 231, you can see the peaks moving up and down)
I found 1768 (7127) as the value for the octave above.

Not quite sure what the reasoning is behind this way of mapping. More obvious (to me at least) would seem something like [ 0000 = .25 cfreq, 2000 = .5 cfreq, 4000 = cfreq, 6000 = 2 cfreq, 8000 = 4 cfreq ]

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monoben
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Re: Analogue generator question

Post by monoben » Sun Jun 15, 2014 9:11 am

No worries El Nino. The topic of musical tuning has been has been of interest to me for some time now. I also find guitar tuners are seldom good for anything but guitars and guitars themselves are seldom perfect 12tet. So it was a bit of a hacky method. you might like this video, this is the best way I've seen to deal with temperament: H-Pi Tonal Plexus micro-tonal keyboard. It would be great if Sunvox had the option of a key arrangement like that....hmm.. maybe I should add that to the feature request part of the forum :/ any who back to the octave problem.

Great method spanjerberg!

Using the oscilloscope lines in the module I wasn't able to get the two sine waves to be totally in phase, whatever hex I type in. Are you guys able to verify this?. If you run the analog generator into a delay module and set the delay up like this
Screen shot of Sunvox
then set the delay module oscilloscope to stereo phase. I find that its easy to get the stereo phase display to stop moving with low frequency's (like D2), but the higher you go the harder it gets. Also I found rather unexpectedly that the hex values between (7127) and (7137) have no extra preciseness. :(

My ideal mapping for the frequency2 slider is making 8000 just one octave, perfectly in phase in every octave. from what I understand of the 12tet though this might not be feasible.

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NightRadio
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Re: Analogue generator question

Post by NightRadio » Mon Jun 16, 2014 8:22 am

Sorry guys, i forgot to describe this controller... :oops:
One semitone = 64.
Octave down = 1000 - 64 * 12 = 232
Octave up = 1000 + 64 * 12 = 1768

spanjerberg
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Re: Analogue generator question

Post by spanjerberg » Tue Jun 17, 2014 4:36 pm

Haha, well, this clears it all up, doesn't it :)
Very good to know btw... I've been wondering how to set a major third or fifth... so those should be
1000 + 64 * 4 = 1256
1000 + 64 * 7 = 1448
Thanks NightRadio!

El Nino
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Re: Analogue generator question

Post by El Nino » Tue Jun 17, 2014 11:48 pm

Thankyou everyone involved here. This is awesome and useful information

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