VCO Tuner app

Technology Synth-DIY
#1

Hey y’all,

I’ve posted this on Muff’s a few days back but I thought I’d leave a hint here as well.

I wrote a simple (and still a little whacky) tool to make tuning of VCOs and VCFs easier.
Here’s a video about it: https://www.youtube.com/watch?v=JpMFTOBXuv8

It’s open source and runs on Mac, Windows and Linux!
Here’s the download for the latest version !

Just for fun, I measured one of my Shruthis and its (of course) super well tuned :wink: Though I have to admit, I’m surprised how little error there is in the upper octaves (where the accumulator’s bit-width should be noticable the most). Interestingly I did two different measurements and both have large errors in the low octaves. One has especially large errors in the notes 27 and 30 (both are off-chart and were ~1/2 semitone! I wonder if that has to do with carrier bleed? Maybe…
Here’s the one with the larger errors:

And this one is a bit better:

Anyways, I’d love to hear your feedback on this and I hope you find it useful.

#2

This is an excellent idea, i wish i had this before. Tuning VCOs over 8-10 octaves the hard way is really awkward.

#3

The phase accumulator bit width limitation comes into play at low frequencies (the phase increment, which is equal to the note frequency divided by the sample rate, is low).

#4

Oops, you are right. I was thinking the same but I came to the wrong conclusion.

#5

nice idea,thanks : )

#6

Neat! :slight_smile:

#7

Thanks TheSlowGrowth - very handy utility

Martin