<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">No idea if this is related. My MOTU Ultralite AVB has a problem with capture. The USB audio driver gets confused about which channel is which, and so channels 1-8 can get "mapped" as 16-24 or 24-32 (ditto for other groups of channels). The remapping is random (it is different every time the device is opened. It seems to affect only capture, not playback. </div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">this is with: Advanced Linux Sound Architecture Driver Version k4.9.0-3-rt-amd64. </div></div><div class="gmail_extra"> <div class="gmail_quote">On Fri, Mar 16, 2018 at 11:57 AM, Joe Hartley <<a href="mailto:jh@brainiac.com" target="_blank">jh@brainiac.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Fri, 16 Mar 2018 10:58:36 +0100 Atte <<a href="mailto:atte@youmail.dk">atte@youmail.dk</a>> wrote: > I have two computers, a laptop and a desktop box running identical setups: Debian stretch with 4.12.0-14.3-liquorix-686-pae kernel and jack version 1.9.10. > > On the laptop my mtk22 works perfectly, on the box the first 16 channels are silent. I don't understand what you mean by 'silent' here. If you are taking an input signal and seeing it at your DAW but not hearing output, check that the USB Return buttons on each channel are not pressed. When pushed in, the mixer is expecting those channels to take their input from the computer, which allows the use of plugins in a DAW to be used to effect the 'live' output from the mixer. You refer to "the first 16 channels". This raises the important question of what happens on channels 17/18. The MTK22 has 14 mono channel strips, followed by two that can accept either a mono XLR or 2 1/4" connections (input channels 15/16 and 17/18, followed by one that only accepts one or two 1/4" (input channels 19/20), then finally one that takes either 2 RCA or a USB input (channels 21/22). What are these upper channels (17-22) doing differently than the others > 1) the box worked perfectly with the mtk22 when I ran debian 8 (jessie) > 2) the box doesn't work even with the build in usb ports > > I'm suspecting "something" might be grabbing the first 16 channels of the mtk22 somehow, tried disabling pulseaudio (sudo chmod -x usr/bin/pulseaudio and rebooting), still doesn't work. I can't speak to anything pulse related as I don't use it and don't install it on my machines (Arch does not make it a dependency like other distros). It could be a JACK routing issue with some config persisting from something else. Have you looked at the routing table, both at the JACK and at the DAW levels? -- ====================================================================== Joe Hartley - UNIX/network Consultant - <a href="mailto:jh@brainiac.com">jh@brainiac.com</a> Without deviation from the norm, "progress" is not possible. - FZappa _______________________________________________ Linux-audio-user mailing list <a href="mailto:Linux-audio-user@lists.linuxaudio.org">Linux-audio-user@lists.linuxaudio.org</a> <a href="https://lists.linuxaudio.org/listinfo/linux-audio-user" rel="noreferrer" target="_blank">https://lists.linuxaudio.org/listinfo/linux-audio-user</a> </blockquote></div> </div>