Daisy Patch CV inputs and Pitch and midi_io issue

The standard voltage range of the volt-octave is 0 to 10V. The daisy only accepts a voltage of 0 to 5 V. When I connect the pitch output of my arturia beatstep pro - I can see that most of the notes are clumped. Does this mean that I will not be able to use the CV input for work with the pitch from the sequencer? I also noticed that the daisy does not accept negative values in its pure form. Using the poke method, I found that the position of the potentiometer affects the range of values and to get the range 0 - 1 from the incoming -5 +5 volts, you need to turn the knob to the central position. (I use max msp gen~ and expert sleepers es-8 for meashuring)

I tried running the midi_io patch from the oopsy examples. Everything works in Max. But after uploading to daisy, I didn’t get any sound. I tried the midi signal from different sources - the result is the same, nothing happens.

Hello @agrabovskiy,

From what I have in my EuroRack system I see a range of devices from 0 to 5V, along with -5 to +5 and 0 to 10V. One of the things that is nice about EuroRack is that one can use 5V to get a 5 octave range. (1v per octave) and from there tune different oscillators up or down from that base… or use the 0-5V to drive other parts of your gear… and if needed you can always bring in a voltage multiplier as well. So lot’s of great options.

Also, if one is building their own hardware, you can always create a 0 to 10v or -5 to +5V device as well.

I hope that helps a little bit.


Thanks @BHAudio! Yes, it seems that using some shamanism, you can get the desired result, but in any case, you will not be able to use the raw signal from the sequencer. It will have to be processed in some additional way. It is a pity that you can not read up to 10 volts. What about the midi?

Yeah exactly. The notion of a “standard” voltage range in Eurorack is kind of laughable… some devices like 0-5v, some like -5v-5v, some like -3v-6v, some only handle 0v-3v, some like 0v-8v, some like 0v-10v, and so on. But anyway, many devices also have offset knobs to shift that range, so what really counts is the peak-to-peak range.

In the case of the Daisy Patch, the CV inputs have a peak-to-peak range of 5 volts, and the knobs are offsets from zero. That is, the knob value (0-5v) is added to the CV input (whatever that is) and then effectively measured over the range 0-5v. So, if you want to handle -2.5-2.5v, put the knob at around 12 o’clock. If you want to handle -5v-0v, turn the knob all the way CW. There’s no way to get more than a 5vpp range, because that’s all the device can measure.

Whatever that 5v range is, it is mapped to the @min and @max of the [param]. If you didn’t specify @min or @max, that means 0 to 1. So, if you want to handle v/oct, I suggest setting the param to @min 0 @max 5 accordingly. (There’s also a helper abstraction included with oopsy (oopsy.cv2hz) to convert such a v/oct to Hz.)

I should point out that the cv/knob inputs on the Patch are not calibrated out of the box, and as yet, calibration is a TODO issue in the github. I’m hoping to get to that very soon. On my Patch it tracks somewhat well over a couple of octaves, but is pretty out of tune at the extremes.

Part of your OP I didn’t quite understand (“Using the poke method…”) – but hopefully this helps clear some things up?

I’m not sure how to help you with the MIDI example, it works perfectly here. I wonder if it might be the midi cable? The midi ports on the Patch are type A (I think the BSP has type B, so not compatible – you’d need to get/make/adapt the appropriate cable).

BTW I’ve done a lot of work on MIDI handling in the dev branch which adds far more convenient midi handling, like [param midi_cc1] etc. Hopefully this can be packaged up as the next release of Oopsy very soon.

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Re. your initial comment about the Beat Step. I was actually using a Beat Step Pro with Eurorack oscillators fairly recently.

For some strange reason, the lowest note of the BeatStep Pro by default (or at least on the one I was using) was sitting around 2V. I can’t recall exactly what it’s called, but there is a setting in the computer software for the device that allows you to adjust the lowest note to 0V.

Haha ))) Sorry. This is a Russian proverb. It probably sounds meaningless in English. It means finding a solution empirically

@grrrwaaa I have another question about reading wav files from SD card. I left a comment in the corresponding issue on oopsy github. Can you tell me about that, too?

Ey, what’s up. Just read this and wanted to add something. I had an Arturia Keystep and, as far as I know, I can change the voltage of the CV/Gate outputs by using the Midi Control Center software that comes with any Arturia. Did you check that?