MrK
July 6, 2025, 6:13pm
1
Hope I’m posting to the correct section.
I installed the beta patcher and flashed the usb audio firmware onto one of my legacy axolotis. I’d like to use it with a zynthian I made diy (not the official build but that shouldn’t matter).
I’m not very good with the Linux terminal commands and am assuming that I will need to install the udev file, but don’t know how. The chmod command doesn’t work, I assume because I don’t have the patcher installed on the zynthian?
If anyone is familiar with Zynthian I would very much appreciate any ideas/help. It would be awesome to get the two working together.
usb audio is currently not stable yet
USB Audio in 1.1 should be fine as far as I am aware. (@ksoloti is all the new code in there now?)
if you type aplay -l what do you get?
I’m not sure if you need to do the udev thing just for USB audio to be available. The USB soundcard part usually doesn’t need any additional permisisons?
You’re planning to run the Patcher on a Mac or PC and program your Axoloti there, then set your patch (with USB audio objects patched up) as startup and connect Axo to your Zynthian?
The Zynthian is just a Raspberry Pi (at least it was back then) so you’d have to create a startup script there which would connect Zynthian’s I/O to Axoloti USB audio I/O. Zynthian possibly uses jackd to make audio and MIDI connections - does Zynthian have some shield with an audio codec on it?
MrK
July 8, 2025, 3:23pm
5
Yes on planning to patch on another device and then use the axoloti with the zynthian.
The zynthian sees the axoloti because every time I turn it on with the axoloti plugged in, it won’t start up, instead giving an audio/usb error, I believe it also says “no PID” or something like that.
When I plug the axoloti in after turning on, it shows up with lusb. I can’t try aplay -1 at the moment because my zynthian is currently helping some pieces keep their form while the wheat paste dries on a synth stand I’m building. My guess is that aplay -1 wouldn’t work because when I plug it in and try to use it as a usb hotplug device it doesn’t show up even though it’s there when I type lusb in the terminal.
And Zynthian does use jackd.
If the aplay -l is not working try lsusb -v and paste the text for the axoloti here.
Also I’m not sure anyone has actually ever tested the USB Audio on an axoloti before!
Actually I have :D. It seemed to work exactly the same like on Ksoloti.
MrK
July 9, 2025, 8:54am
9
So this is what came up with play -l
MrK
July 9, 2025, 9:01am
10
And here is what came up for lsusb -v
Bus 001 Device 005: ID 16c0:0447 Van Ooijen Technische Informatica Axoloti Core
How does Zynthian configure its audio? jack/qjacktcl? alsa?
MrK
July 9, 2025, 6:25pm
12
I believe it’s alsa. At least in the past I’ve used alsa mixer to adjust levels.
As aplay -l can see the axoloti it looks like at the ALSA level it is fine, is there a setup screen in Zynthion where you set what audio interface you want to use?
What version Zynthian do you even have, there are like 6-7 out there now
It looks like here’s some DAC config stuff
MrK
July 11, 2025, 3:09pm
16
Thanks to you both for your help! I haven’t done a full scale test on it yet, but it seems to work just fine!
I’m pretty excited to start expermimenting with what these two can do together (if only saving me some cable connections).
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