What do I have to do to get my sound back?

[Dave M G]

Ubuntu Users,

	Despite working fine for many, many months, my USB sound device has
suddenly stopped working without any apparent cause. It also has not
come back into use despite a couple of attempts to repair it.
	I am positive the hardware is working fine, because I can boot into
Windows and verify that all components are working as expected. So this
has to be a Linux settings issue.

	I have modified my .asoundrc file to no effect. I have run
dpkg-reconfigure -a with no results.
	
	I have two sound devices, as shown below. I want the Kenwood Audio
device to work again. What can I do to diagnose and repair the problem?

dave at ubuntu1:~$ cat /proc/asound/cards
0 [Live           ]: EMU10K1 - SBLive! Value [CT4780]
                     SBLive! Value [CT4780] (rev.7, serial:0x80221102)
at 0xece0, irq 17
1 [Device         ]: USB-Audio - Kenwood  Audio Device
                     Kenwood Kenwood  Audio Device at
usb-0000:00:1f.2-2.2, full speed

--
Dave M G