Chris Bungue wrote:
  I only have three sound cards, not four.
 One audio card,  DSP2000 and two usb cards for midi, Midisport 4x4 and
 a master keyboard UF6
 But in /proc/asound/cards is another usb device which I don't know. 
You don't know that your mainboard comes with an on-board sound device?
;-)
  Bus 002 Device 002: ID 0763:1021 Midiman MidiSport 4x4
 Bus 002 Device 003: ID 046d:c00c Logitech, Inc. Optical Wheel Mouse
 Bus 002 Device 004: ID 7104:2202 CME (Central Music Co.) UF5/UF6/UF7/UF8 MIDI Master
Keyboard
 Bus 002 Device 005: ID 0d8c:0201 C-Media Electronics, Inc. CM6501
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Could it be the Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub which make
trouble? 
Well, as far as I can see, you don't have any actual trouble at the
moment, and being able to connect USB 2.0 devices might be a good idea ...
Regards,
Clemens