@Runcell, Squinky Labs EV3 might work. Three oscs in one module that track when you change knob 1. Knobs 2 and three can change the octave (I think) and changing knob 1 still has changes in the other two knobs.
Why, oh why, is there no separate knob for the octave on VCO’s? Such a simple thing that would allow me to do what I am trying to do!
I’m using 6 BEFACO oscillators so that each (main) oscillator, so to speak, has the 2 subs… they’re all trackable from either 4 step sequencer.
I tried the using just 2 BEFACO oscillators and the pitch shifter from BIDOO on the split outs but thought it sounded better using seperate OSC for each (subs).
The BEFACO oscillators have an input for octave, by using a fixed voltage source, a switch and a big button… 1 volt per octave, so +1 volt into the octave input = +12 semitones or 1 octave (+8ve).
Alternatively there is STACK from BOG AUDIO, plug pitch CV into STACK first and then into the oscillators 1v/oct input, then can use the octave dial on STACK.
Hey @playinmyblues, I’ve posted a MiRack version of the Subharmonicon onto patchstorage… Let me know what you think.
I’ve used 8 VCA’s instead of a MUTE8 because you can see if a signal is passing thru or not, with the green flashes. The OCTATRIG is not needed because the Rgate, gate length has been shortened to make triggers.
This version is different from Omri’s (although same results) in that I’ve added some of the front panel controls, like the octave (big) button will transpose up or down 3 octaves, filter dial (as a tact-1 slide cntrlr), resonance dial (tact slider again), filter env - attack & decay dials (x2 tact sliders)… etc etc… it loosely resembles the front panel layout.
ALSO… MiRack does not have the BUS ROUTE (logic) module which makes things look a little different compared to Omri’s patch… I’ve had to use 2 OR logic modules and switches.
all the best
runcell
Thank you. I was going to ask about your version so I can see how you are patching things. I will have a look.
I am the other builder that @playinmyblues mentions.
I have to say your version is wonderful and very playable. Lots of things to study and learn from :
Fwiw, I did load my version last week in patchstorage: https://patchstorage.com/subharmonicon-omri-cohen-v1-0/
Cheers
sowari
Hi @sowarimodular, thanks yes very playable…each time I have a go with it I find something very usable…and each time different.
It took a bit of head scratching to get round the BUS ROUTE module that Omri uses… and it would be nice to have something similar to count modular freq div in miRack, if we haven’t already.
I will take a look at your version and you can always adapt it and copy parts my patch if you want to build your own up.
Thanks @playinmyblues for bringing this up, I now have something to play with…for a bit 
runcell
1 Like
Hey @sowarimodular, just been playing on your version… all is good up to the oscillator section… BUt… when I plugged from SWITCH88 outs to the TIDAL MODULATOR’s 1v/oct inputs it all came together nice and definitely useable. Not sure you need the TIDAL MODULATORS in there, but it works.
cheers
runcell
Hi @Runcell, you have a great layout and it makes it looks like fun to play.
I was looking for the frequency division sections. Are you getting frequency division by using the octave range on EvenVCO or is there another section I am missing?
Thanks man 
. Yes getting divisions from octave dial on the extra oscillators.
The frequency division (count modula) is only necessary if using only one oscillator (for each oscillator section)… what Omri does is take a split from one oscillator, half’s the frequency with count mod (which is 1 octave lower) and labels it OSC 1 sub 1… he then half’s the frequency again with another split & count mod so that sub 2 (osc1+2) is now 2 octaves below.
What I’ve done is use 3 oscillators for OSC 1 (the osc plus the 2 subs) and 3 for OSC 2 so there is no need to split then divide. Sub OSC 1 is one octave below and Sub OSC 2 is 2 octaves below. This is because we do not have count modula audio/clock freq divider for MiRack… I tried a pitch shifter from bidoo, but preferred the sound of how it is now.
Hope that helps
runcell
Thanks for the explanation. I think I had just gone about it in a way that was sticking with the Omri Cohen’s version. But is really more arbitrary.
I really like the big buttons and Tact-1 sliders, which are great for the iPad. The sound from yours is much smoother than mine.
It is great to see other modules used in the process.
sowari’s version is also a lot smoother and has some interesting controls for reverb and delay. And then there is mine, which has a little more grit in the sound, if you like that sort of thing. It also allows for more control over the shape of the sawtooth wave, changing from descending to ascending and points in between.
I think the reason I used a modulation generator was it allowed me to get a descending sawtooth wave while EvenVCO only has ascending. The Moog Subharmonicon has the descending sawtooth.
No problem . I followed Omri’s way, except for the Octatrig (because Rgate length can be shortened to triggers) and the oscillator section… Oscillator 1 is actually 3 single oscillators instead of 1 oscillator spilt twice. And oscillator 2 is the same.
The big buttons and Tact slide controllers are perfect for iPad…
To flip a saw wave or any wave, you only need an inverter or an attenuverter, like the one from BEFACO, just plug the saw wave thru this and turn the white dial (fully) anti clock wise… and check it on a scope to see.
runcell
Thanks for the tip on the sawtooth wave inversion.
I think I would still like to see the ability to change the octave selection with any VCO. I would like to be able to use one CV into a multi to change a bunch at one time.
On my subharmonicon patch there is a big button labelled ‘octave +/-3’, it does exactly what you describe and transposes the whole (sequence, all 6 oscillators) up or down by 3 octaves (6 octave range). One button controls all 6 oscillators’ octave inputs,… except we don’t really need the multiple module in virtual land, we can connect multiple plugs from 1 output.
1 Like
Hmmm. Thanks. I feel like I should almost stop as I need to check out all these options I keep asking about. lol
Seriously, thanks though.
1 Like
No problem, ask away… if I don’t know, I won’t try to bluff it. I’ve been using synths, samplers every day for 30+ years, which means, I don’t know everything 
I can talk about synths all day long.
Hi Runcell, to clarify, the Tidal Modular is there so the user has the option of square and saw waves. The RGATE sends out square wave and the Tidal Modular saw. The gate out from the RGATE goes to the clock input of the Tidal Modular so they play the same pitch.
On the hardware Moog Subharmonicon, there is a choice of square and saw for all of the oscillators and subharmonic oscillators. I was trying to reproduce those options.
Cheers
Phil
With Omri’s video he is using the frequency dividers to send out frequencies that behave like the Moog Subharmonicon. That means the divisions follow the harmonic series going down instead of up. So, that means octave, then octave/fifth, 2 octaves, 2 octaves/major third, etc, etc. Clearly these go out of tune the low the subharmonic.
Phil
I see, Ok, first the Rgate outputs gates only… it is not audio waves that it puts out. It might look like square waves on a scope, but I promise you, they are not. They are gates and gates have a voltage range of 10 volts from zero to +10… any thing less and the device that the gates are controlling will probably not respond. Gates are like an on/off switch… with a 50% (pulse) width and triggers are the same with a 1 or 2% pulse width. They trigger things, and keep things in time/sync etc…
must dash… back soon
Sorry about that… where were we… Square waves… are positive to negative and can be used as quasi-gates but best to get the basics nailed down first.
The switching - is done with the BOG AUDIO SWITCH. There are 10 oscillators in your patch for a 6 oscillator synth. Like Omri has done, only 1 oscillator is needed to switch between saw wave and square wave, the BEFACO EVEN VCO has outputs for each… So, all you have to do is plug from saw wave out to input A on the switch, then (from the same OSC) plug the square wave out to input B on the switch. The output of the switch plugs into a mixer. Select LATCH so that when the switch is pressed it holds its position (A position is saw, B position is square) and what I’ve done in my patch (that Omri didn’t) is connect a big button to the gate input, so that I don’t have to zoom in to hit that tiny button each time I need to change waveforms…
The oscillators in the hardware Subharmonicon may be one oscillator, divided down twice to get the 2 subs…OR there could well be 6 individual oscillators in there… I wouldn’t know without looking at the service manual… BUT the end results will be the same and the principals are the same… you need to get 6 …er…voices so to speak - Oscillator 1 plus the 2 subs and Oscillator 2 plus the 2 subs…
…And what Omri did was to divide the first so that it was 1 octave below OSC 1 (8 whole tones or 12 semi-tones) not a fifth. The second sub OSC was divided from the first divider then to the second divider, so half then half again -2octaves.
I hope that helps a little… if you need any clarifications at all, just post em’ up, happy to help
runcell
1 Like
Hi @Runcell, some very good point which have got me thinking - more of that later.
FYI in the hardware Eurorack/Modular Synch scene, it is common practice to use clock dividers as subharmonic oscillators by sending audio rate signals to the input. It is also common practice to use function generators - like rampage - and get similar results by using the ‘rise’ slider to transpose the audio rate signal - or self oscillating looping generator - downwards to get ‘subharmonics’. Clearly this is a ‘poor person’s method’ as the result are glitchy but we do get an audio signal that is sort of like an oscillator.
I agree that the output of an RGATE is not a true square wave but when processing audio rate signals the CLK DIV knob behaves a bit like the subharmonic oscillator on a Moog Subharmonic synth.
NOW, your post got me thinking and it is possible to make a unipolar square wave into a bipolar square if you with use a polarizer or attenuverter. see attached screenshot - sorry for using VCV 
Best
Phil
1 Like