Hello i am juan and i am trying to use this (Roland UA-4FX2) sound card on linux, I posted this on the github and they recommended to put it on this mailing list.

from https://github.com/alsa-project/alsa-lib/issues/81

hi

i'm trying to use this audio card with a Raspberry pi and y get this from the command dmesg on linux console

``` usb 3-2: new high-speed USB device number 6 using xhci_hcd usb 3-2: New USB device found, idVendor=0582, idProduct=01e2, bcdDevice= 0.2b usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 3-2: Product: UA-4FX2 usb 3-2: Manufacturer: ROLAND mc: Linux media interface: v0.10 usbcore: registered new interface driver snd-usb-audio usb 3-2: Unable to change format on ep #8e: already in use usb 3-2: Unable to change format on ep #8e: already in use : : ```

and when i try to select the device on a program get this

``` ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card ``` it seems that the card is not supported by ALSA lib. How is the procedure to add new cards to the driver?

How can I help to do this?

Thank you