[LAU] Specifying sample format in ALSA

Hello, I'm using Arch Linux (AArch64) for the first time on a Raspberry Pi 4. I need to use HDMI sound and the first HDMI port on the pi is card 0. If I try to use aplay to play a sound file it prints: aplay: set_params:1343: Sample format non available Available formats: - IEC958_SUBFRAME_LE I find that I can play audio through HDMI by specifying the sample format. eg. aplay -D iec958 mysound.wav What I'm stuck with is trying to configure ALSA to make this specification. I've tried the following in my ~/.asoundrc pcm.!default {         type plug         slave {               pcm "hw:0,0"               format IEC958_SUBFRAME_LE } } While this produces no Alsa syntax errors when I use aplay, it still won't play the audio and prints: Playing WAVE 'wav48k.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo aplay: set_params:1343: Sample format non available Available formats: - IEC958_SUBFRAME_LE Can anyone please help? Thanks, Iain -- ________ Iain Mott https://escuta.org