# Help with Hz/V troubles?

I’m unsure if I’m missing a step or if this functionality is not working properly, but I can’t get the hermod+ to send notes in Hz/V to my MS20.
In the “CV Out” menu I change the Output Standard to Hz/v. What I get is a series of notes that jump drastically over what should be a few semitones, drop back down and repeat.
It’s not the synth - I confirmed this with an oscilloscope.For example, moving up in semitones : 0.38v, 1.89v, 3.49v, -5.14v, -3.01v, -1.11v, 0.9v, 3.04v, etc

Can anyone lend a hand here? Thanks.
i

Hi @Chud
Thanks for your feedback!

I’ve just tested it and the Hz/V feature is only working for notes between C0 and Eb3.

As Hermod+ hardware CV outputs has a range of -5V to +5V, it allows 10 octaves of V/OCTAVE notes, but only 3 octaves of Hz/V notes.

The Hz/V alternative standard is exponential and so it requires a very large range of voltage : to get 10 octaves, the voltage output would be 0V to 1024V !

Maybe it’s easier to understand with figures:
C0 = -5V (V/OCTAVE) = -4V (Hz/V)
C1 = -4V (V/OCTAVE) = -3V (Hz/V)
C2 = -3V (V/OCTAVE) = -1V (Hz/V)
C3 = -2V (V/OCTAVE) = +3V (Hz/V)
C4 = -1V (V/OCTAVE) = OUT OF RANGE (Hz/V)
C5 = 0V (V/OCTAVE) = OUT OF RANGE (Hz/V)
C6 = +1V (V/OCTAVE) = OUT OF RANGE (Hz/V)
C7 = +2V (V/OCTAVE) = OUT OF RANGE (Hz/V)
C8 = +3V (V/OCTAVE) = OUT OF RANGE (Hz/V)
C9 = +4V (V/OCTAVE) = OUT OF RANGE (Hz/V)
C10 = +5V (V/OCTAVE) = OUT OF RANGE (Hz/V)

But indeed, there is an issue with the out-of-range notes, that were transformed to wrong CV output values. It will be fixed in the next OS version!

Cheers,

Thank you. I look forward to the firmware update.

Oh, and while you’re at it, is there any chance of including an S-trig option?

Nope, S-trig can only be done with an external hardware circuit