[LAU] Help getting sound from Cakewalk UA-25 EX to Ardour

[Chris Caudle]

On Thu, March 22, 2018 5:50 am, Hernán Labbé Grünberg wrote:
> instrument to my computer via a usb-interface, the Cakewalk UA25-EX,
> which I know works with linux.

Did you see that on the Ardour forums someone posted a link to a very good
page specific to that interface?
https://alsa.opensrc.org/Edirol_UA-25EX

It seems that interface has two different modes of operation, basic (USB
audio class 1.0) and advanced (seems to be proprietary, not fully USB
audio 2.0 class compliant), and has hardware controls to set sample rate.

That page also claims that alsamixer cannot control any of the hardware
parameters of the device.  There is output from the CLI version of 
alsamixer showing that there are no controllable parameters on the device,
not sure why whatever tool you used did not display a similar message.

What sample rate are you using?  At 96k the device can only operate as
input or output, not both at the same time.  44.1k and 48k support full
duplex (in and out at the same time) at 24 bit sample size.  Basic mode
(usb audio class 1 compliant) supports only 16 bit sample length.

It appears from that page that the best recommendation would be advance
mode and either 44100 or 48000 sample rate.

-- 
Chris Caudle