From mboxrd@z Thu Jan  1 00:00:00 1970
From: Clemens Ladisch <clemens@ladisch.de>
Subject: Re: M-Audio FastTrack C400
Date: Wed, 18 Apr 2012 09:26:26 +0200
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To: Grant Diffey <gdiffey@gmail.com>
Cc: alsa-devel@alsa-project.org, chris-alsa@rauros.net, Daniel Mack <zonque@gmail.com>
List-Id: alsa-devel@alsa-project.org

Grant Diffey wrote:
> So this looks reasonably familiar,
>
> int0 is DFU
> int1 is mixer
> int2 is audio out
> int3 is audio in
> int4 is midi
> int5 is HID
>
> Quirk should look like the fast track ultra basically. maybe the mixer is less broken in this device?

There only one way to find out.  :)

{
	USB_DEVICE_VENDOR_SPEC(0x0763, 0x2030),
	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
		/* .vendor_name = "M-Audio", */
		/* .product_name = "Fast Track C400", */
		.ifnum = QUIRK_ANY_INTERFACE,
		.type = QUIRK_COMPOSITE,
		.data = & (const struct snd_usb_audio_quirk[]) {
			{
				.ifnum = 1,
				.type = QUIRK_AUDIO_STANDARD_MIXER,
			},
			{
				.ifnum = 2,
				.type = QUIRK_AUDIO_STANDARD_INTERFACE,
			},
			{
				.ifnum = 3,
				.type = QUIRK_AUDIO_STANDARD_INTERFACE,
			},
			/* interface 4 (MIDI) is standard compliant */	
			{
				.ifnum = -1
			}
		}
	}
},


Chris, add this to sound/usb/quirks-table.h and recompile the kernel.


Regards,
Clemens