The short answer is there is no CV input / output on the Organelle.
All of the audio ports are AC coupled, so they won’t pass DC. This is usual for audio in / out.
The pedal input is an analog input, but it has a pull up resistor (10k) internally so that it will work with a foot switch. Some expression pedals work like this (such as the Line 6 one), others not so well. The jack was always for a foot switch, then we decided to wire it to an analog input so it would work with some expression pedals as kind of a bonus.
It would be cool for Organelle to have CV built in, but for now CV can be achieved with a wide array of MIDI to CV modules:
I tested it with the SBG from ALM with the supplied cable (floating ring) as well as with a mono (Jack - mini Jack) cable. Both din’t work. Does anyone knows the wiring of Organelles Pedal input? maybe @thetechnobear?
[edit] it‘s working when you use [r exp] instead of [r fs]
when i checked with a voltmeter yesterday - i thought I found = ~3v, ring = signal (return), sleeve = ground…
which seems to be the opposite of what the SBG pedal says is the ‘normal’, and this from strymon, both say its usually signal on the tip, ref voltage on ring.
but it would account for why its not working for you…
I’m not sure i want to try though, as dont want to blow up an organelle…
@oweno / @chrisk can you confirm - is organelle using tip as ref voltage, ring as signal return and ground as sleeve?
if so, a 3v pulse returned on the ring should be safe - no?
The pedal input wiring is tip -> signal, no ring, sleeve -> gnd. The signal is pulled high (3.3v) with 10k resistor so it works easily with a simple spst footswitch, but not so good as general purpose analog input.
This means the ALM cable should work (Tip->Voltage / Sleeve -> Ground). Can it be that intervals of 3V gates is not enough? Does it needs to be 3.3V? Or is i a question of the right pedal settings in the OS3.1? @oweno / @thetechnobear
[edit] an spst pedal works the same right? its just switching the signal voltage (3.3v) on/off ?
Okey, its working!! I needed to use [r exp] . Now i receive a signal flow depending on what i hook up to the SBG. I created a test patch to see if i can read out BPMs from a LFO.
I put together a small ready-made patch, that you can use to complete your own patch!
It converts a CV-clock to [bang] and measures the time between them in milliseconds. I noticed some latency and fluctuations (~ 70ms). Please note that this patch is not a finished sequencer or such, it should serve as an aid to bring cv in to your organelle project. Also it is made for the S.B.G. module. There might be other eurorack modules which might fit. Important is that a such delivers 3V not more!
Delay and fluctuations are expected, because [r exp] receives a control-rate signal. Control rate depends on block size. The longer the block, the bigger the perceived latency and jitter.
So while this is working, you can’t expect this to be reliable rhythm-wise.
70ms is too high for control rate fluctuations.
And the control rate will also affect midi output in the same way… and keys etc, and we’re not seeing 70ms there.
I suspect, it might be possibly related to how the exp comes from the micro controller then to mother host (via serial) , the mother host to pd (via osc).
However I’m still surprised this is anywhere near 70ms, given keys are doing the same thing.
Perhaps need to check the code, and see if for some reason the exp pedal is treated differently?!
