You have configured your ALSA default device to use your sound hardware directly and as most sound hardware it is not able to mix different signal sources. Therefore ALSA uses dmix (a software mixer) as default, so different sources can be played at the same time with every hardware.
Here is a example:
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pcm "hw:0,0" # for ICE1724's analog output
rate 44100 # see cat /proc/asound/card0/pcm0p/sub0/hw_params
(note: format or rate probably can be removed or have to be changed)
PS: no idea why your flash needs some ALSA extra config to work