Default pcm device question

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Hello all,
I have an Edirol UA-25 USB soundcard, which is my default and only
soundcard:

pal@debian:~$ aplay -l                     
**** List of PLAYBACK Hardware Devices ****
card 0: UA25 [UA-25], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

If there is no .asoundrc neither /etc/asound.conf aplay segfaults:

pal@debian:~$ aplay test.wav
Playing WAVE 'test.wav' : Unsigned 8 bit, Rate 22050 Hz, Mono
Segmentation fault

However, specifying the device does work:

pal@debian:~$ aplay -D plughw:UA25 test.wav 
Playing WAVE 'test.wav' : Unsigned 8 bit, Rate 22050 Hz, Mono

Is this the expected behaviour? If I write this to .asoundrc
pcm.!default {
        type plug
        slave {
                pcm "hw:0,0"
        }
}
then aplay works without the -D option.






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