Hertz to volts conversion?

There didn’t really seem to be a right place to put this.

I want the 8FO to complete a cycle over 4 bars @86bpm. The calculation needs to be in hertz to enter into the 8FO’s frequency. As it will include a Logarithmic calculation I need help. I know there is a BPM LFO but I want to use all 8phases of 8FO to modulate the harmonics of Chevyshev and DBiz harmonic generator so using the BPM LFO won’t do it.

If anyone could please help with a formula for this I would be very grateful.

(16 beats)x(1 minute/86 beats)x(60 seconds/1 minute)=11.1627907 seconds

1cycle/11.1627907seconds= 0.089583333333333 cycles/second

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From https://vcvrack.com/manual/VoltageStandards#pitch-and-frequencies, f = 2 Hz \cdot 2^V for LFOs with their frequency knob at its default position. Solve for V to get V = log_2(f/2Hz). Use @dronehands’ result for f.

However, you can set the Hz directly on most LFOs, so knowing the voltage is unnecessary, unless you want to control the LFO with another module.

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i misread the question :confused:

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Thanks Droneheads. That was the same calculation that I did. but it was still way too fast. Shows we were (almost) thinking on the same lines.

Thank you Andrew.

That’s exactly what I needed.

Now all I need to find is my scientific calculator, which I haven’t used for around ten years.

I really appreciate it


Just use Google. Rack v2 will be able to evaluate expressions entered in parameter text fields.


An easier way would be (86bpm / 60sec) / 16cycles / 4bar = 0.0223958Hz

Trim LFO has a BPM version. You can adjust the tension screws to get 86 bpm and it is just a matter of increasing / decreasing the main value which will snap to multiples of 0.5.


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for me the easiest way would be to use the AS BPM/Hz module

then I use the Note setting 1: 2791 ms. = 0.36 hz I’d divide the hz or multiply the ms by 16 (if you have a 4 beat/bar)
and that should give the needed speed for the lfo = 44656 ms = 0.0225 hz (which is roughly = 0.0223958 :wink: )

but I’m in no way scientific or have any mathematical knowledge,
maybe I’m wrong with doing my math here


The only thing with that is the accuracy of 0.36 Hz it does not equal a full bar for 86 BPM. 0.36 is about 86.4 BPM over 4 bars over time this would be miles out of sync. Even a 0.001 BPM deviation would be out of sync over time.

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yep, you’re right, but for a quick test it may work :wink:

so it would be better to use 0.358294518093 hz for 1 beat. which makes = 0.0223934073808125 hz = 44656.00000010 ms

but the values might be a bit different depending on how the calculators work