同じ名前を持つ多くのオーディオデバイス：asound.confでどのように使用しますか？

ALSAで新しいPCMデバイスを作成したいと思います。おかげでALSA PCMプラグイン存在する/etc/asound.conf：

pcm.blah {
  type rate
  slave {
    pcm <device1>
    rate 48000
  }
}

しかし、名前は何ですか<device1>？

これにより、aplay -L同じ名前の複数のデバイスが表示されます（下記参照）。

選ぶ方法正確に1つのデバイスに複数のasound.confデバイスの名前が同じだと思いますか？default（たとえば、以下のリストには少なくとも3つのデバイスがあります）

root@samplerbox:~# aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
blah
default:CARD=ALSA
    bcm2835 ALSA, bcm2835 ALSA
    Default Audio Device
sysdefault:CARD=ALSA
    bcm2835 ALSA, bcm2835 ALSA
    Default Audio Device
dmix:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct sample mixing device
dmix:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct sample mixing device
dsnoop:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct sample snooping device
dsnoop:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct sample snooping device
hw:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct hardware device without any conversions
hw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct hardware device without any conversions
plughw:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Hardware device with all software conversions
plughw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Hardware device with all software conversions
default:CARD=DAC
    USB Audio DAC, USB Audio
    Default Audio Device
sysdefault:CARD=DAC
    USB Audio DAC, USB Audio
    Default Audio Device
front:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Front speakers
surround21:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Direct sample mixing device
dsnoop:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Direct sample snooping device
hw:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Direct hardware device without any conversions
plughw:CARD=DAC,DEV=0
    USB Audio DAC, USB Audio
    Hardware device with all software conversions
default:CARD=LPD8
    Default Audio Device
sysdefault:CARD=LPD8
    Default Audio Device