Can't get USB Audio to work

I have a record deck with a USB connection which I last used about 9
months ago. The setup was working then and, as I remember, it was
pretty straightforward to set up. Since that time there have been many
Debian updates and I'm almost certainly using a later kernel.

When I came to use it this time in conjunction with Audacity, which I
was using last time, I can't get a peep out of it although playing
sound files, e.g. midi, does work.

I have tried various inputs without success. The appropriate modules
are loaded including snd_usb_audio.

When the USB lead is plugged in I get this in the logs:

kernel: usb 1-7.1: new full speed USB device using ehci_hcd and address
6
kernel: usb 1-7.1: configuration #1 chosen from 1 choice
kernel: input: Burr-Brown from TI
USB Audio CODEC as /class/input/input4
kernel: input: USB HID v1.00 Device [Burr-Brown from TI
USB Audio CODEC ] on usb-0000:00:1d.7-7.1
kernel: usbcore: registered new interface driver snd-usb-audio

a little further on in the log I see:

kernel: cannot submit datapipe for urb 0, error -28: not enough
bandwidth

Originally I got this in the log:

kernel: cannot submit datapipe for urb 0, error -38: enable
CONFIG_USB_EHCI_SPLIT_ISO to play through a hub

so I enabled that in the kernel and recompiled although I'm not using a
USB hub and then got the 'not enough bandwidth' error.

I'm running an uptodate (today) Debian Testing with kernel 2.6.22 and
Alsa modules.

Can anyone suggest what I could do to try and trace the fault as I'm
way out of my depth here?

Regards

--
Barry Samuels
http://www.beenthere-donethat.org.uk
The Unofficial Guide to Great Britain