not sure why you have three playback devices
 
it is strange that there are no capture device 0

you may need to send email to alsa-devel mailing list


http://www.asus.com/Sound_Cards_and_DigitaltoAnalog_Converters/Xonar_U7/#specifications


Analog Output
4 x 3.5 mm jack (1/8") (Headphone out /Side out/Center-Subwoofer out/Rear out)
2 x RCA (Un-Balanced)
Analog Input
1 x 3.5 mm jack (1/8") (Line-in/ Mic-in combo)
Digital
1 x S/PDIF out (1 x Coaxial)


APLAY

**** List of PLAYBACK Hardware Devices ****
card 1: U7 [Xonar U7], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: U7 [Xonar U7], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: U7 [Xonar U7], device 2: USB Audio [USB Audio #2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ARECORD

**** List of CAPTURE Hardware Devices ****
card 1: U7 [Xonar U7], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0


http://git.alsa-project.org/?p=alsa-
lib.git;a=blob_plain;f=test/chmap.c;hb=HEAD


state.Device {
        control.1 {
                iface PCM
                name 'Playback Channel Map'
                value.0 0
                value.1 0
                comment {
                        access read
                        type INTEGER
                        count 2
                        range '0 - 36'
                }
        }
        control.2 {
                iface PCM
                device 1
                name 'Playback Channel Map'
                value.0 0
                value.1 0
                comment {
                        access read
                        type INTEGER
                        count 2
                        range '0 - 36'
                }
        }
        control.3 {
                iface MIXER
                name 'PCM Playback Switch'
                value true
                comment {
                        access 'read write'
                        type BOOLEAN
                        count 1
                }
        }
        control.4 {
                iface MIXER
                name 'PCM Playback Switch'
                index 1
                value true
                comment {
                        access 'read write'
                        type BOOLEAN
                        count 1
                }
        }
        control.5 {
                iface MIXER
                name 'PCM Playback Volume'
                value.0 107
                value.1 107
                value.2 107
                value.3 107
                value.4 107
                value.5 107
                value.6 107
                value.7 107
                comment {
                        access 'read write'
                        type INTEGER
                        count 8
                        range '0 - 127'
                        dbmin -12700
                        dbmax 0
                        dbvalue.0 -2000
                        dbvalue.1 -2000
                        dbvalue.2 -2000
                        dbvalue.3 -2000
                        dbvalue.4 -2000
                        dbvalue.5 -2000
                        dbvalue.6 -2000
                        dbvalue.7 -2000
                }
        }
        control.6 {
                iface MIXER
                name 'Mic Capture Switch'
                value true
                comment {
                        access 'read write'
                        type BOOLEAN
                        count 1
                }
        }
        control.7 {
                iface MIXER
                name 'Line Capture Switch'
                value true
                comment {
                        access 'read write'
                        type BOOLEAN
                        count 1
                }
        }
        control.8 {
                iface MIXER
                name 'PCM Capture Source'
                value Mic
                comment {
                        access 'read write'
                        type ENUMERATED
                        count 1
                        item.0 Mic
                        item.1 Line
                }
        }
}

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https://bugs.launchpad.net/bugs/1267866

Title:
  Broken pipelline when changing the sound card

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