Need Help: Best modules for ES-8 + Audulus Demos




@robertsyrett - where is that little VPO module you posted?


o2VPO.audulus (5.1 KB)



3 posts were merged into an existing topic: Considering a Fully Portable Modular


I just made a nice module last night that helps you tune your VCOs more accurately using a spline. It’s actually pretty quick to use since I added some new features to it. My suspicion is that the ES-8 isn’t like a scientific-grade piece of equipment that exactly outputs a 1 to 1 representation of the voltage, and it needs some compensation to adjust. The Silent Way has a similar utility called the Voice Controller.

I’ve observed it from just routing a patch cable out of the ES-8 and back in and measuring the voltage difference. I seem to remember @robertsyrett you having a similar issue. Anyway, I fixed it and now you can tune within your Audulus patch, create a “profile” for your oscillator (or even self-oscillating VCF that doesn’t have a VPO input), save that profile and use it to compensate when you’re driving it with sequences from Audulus.

I just need to make a better UI for it and I’ll be posting it today in a separate post.


It would be nice if there was a process someone like me could go through in order to have everything calibrated and whatnot.

The first time I ever saw a eurorack module in person was when it came in the mail a few months ago. The only people who know I have a modular are the people on this forum.


Your secret is safe with us :robot:


same, and I’ve been using various modular systems for 8-9 years. never really needed to calibrate anything but I’ve always wondered how to do it, and what the results would yield.

if you’re looking for more modular info you could check out the muffwiggler forum (but as a disclaimer… stick to the main sections, there’s lots of BS in other parts of the forums. I spend less and less time there as time goes on. It does have a nice meetups/gatherings section though, you may be able to find something happening in your area.)


My measurements are that the outputs are less than 0.5% off of perfect -10V to 10V scaling. This means that the intuitive math works just fine.

Inputs are not as spot on. I use the following formula ADC*α + c, where ADC is the channel input, α is the scalar (scaler?), and c is the constant offset.

You can calculate the c just by making an ADC node pointed at an ES-8 channel with nothing connected to it and taking the inverse. It is important there is no cable connected to the relevant input.

In the above example, the adc is steady at -.0015 while after that we hit the noise floor which is flusuating. So the c value is .0015.

The α is calculated by routing a value of 1 out the ES-8 through a DAC node and back into the ES-8 on the channel you were using and taking the reciprocal.

And by that point I am back to less than 1% error for incoming pitch CV.


This is similar on mine - it’s probably more the oscillator, but if you don’t tune them, the oscillator I play in my system will diverge from an Audulus oscillator I’m mixing in.

With the (o+4)/10 have you just used your system’s oscillators or have you had a similar problem I’ve had?

The deviation in volts is small for me but it ends up making a big difference to the oscillator especially the higher up it goes.


Tracking definitely varies from oscillator to oscillator. Makenoise and Mutable oscillators track nearly perfectly. Intellijel is a little wacky, but they have an octave switch built into the oscillators. AJH and Noise Reap, you definitely need to dial in the range you are interested in because I don’t think they have high end tracking compensation across 10 octaves, but I can just shift the octave down in audulus to keep things in the sweet spot of linearity. I sometimes have to do a little tuning by ear before I am satisfied, but that’s perfectly fine for me.


Were you able to try this module out? Were the instructions clear enough inside? I’m going to make a video with this thing so if people don’t understand it they will once they watch.

ES-8 Tuning Offset Profile


I did download it, I will have to wait to try it out until Monday when I get back home. I looked inside and the only thing I thought could use clarification how the signals were routed. It might be good to have a SVG with a simple line diagram to show the patching. A video will definitely help as well, get filming! :smiley: :clapper::video_camera::microphone::musical_keyboard::notes::notes:


Yeah I’ll definitely document it inside the module too, but making a diagram is a great idea!


Just ordered a Plaits! I can see what @robertsyrett was saying about sequencing the modes - really psyched to get videos going for that.