I can't seem to resolve this issue in ALSA/pulseaudio where playing S24_LE pcm data does not seem to work.  My hardware does not support 24 bits, but I was under the impression that alsa would do a conversion to 32 bits when using -D plug. I get the following errors: <div style="margin-left: 40px;"> aplay -D plug:pulse test-sound-files/sine_1kHz_24bit_stereo_44kHz.wav -vvvv </div><div style="margin-left: 40px;">Playing WAVE 'test-sound-files/sine_1kHz_24bit_stereo_44kHz.wav' : Signed 24 bit Little Endian in 3bytes, Rate 44100 Hz, Stereo aplay: set_params:1022: Unable to install hw params: ACCESS:  RW_INTERLEAVED FORMAT:  S24_3LE SUBFORMAT:  STD SAMPLE_BITS: 24 FRAME_BITS: 48 CHANNELS: 2 RATE: 44100 PERIOD_TIME: 125000 PERIOD_SIZE: (5512 5513) PERIOD_BYTES: (33072 33078) PERIODS: (3 5) BUFFER_TIME: 500000 BUFFER_SIZE: 22050 BUFFER_BYTES: 132300 TICK_TIME: 0 </div> Using this device works with ALSA: <div style="margin-left: 40px;">aplay -D plug:hw:0 test-sound-files/sine_1kHz_24bit_stereo_44kHz.wav -vvvv Playing WAVE 'test-sound-files/sine_1kHz_24bit_stereo_44kHz.wav' : Signed 24 bit Little Endian in 3bytes, Rate 44100 Hz, Stereo Plug PCM: Linear conversion PCM (S16_LE) </div> Also using paplay works as well: <div style="margin-left: 40px;">paplay test-sound-files/sine_1kHz_24bit_stereo_44kHz.wav -vvvv      Using sample spec 'float32le 2ch 44100Hz' Connection established. Stream successfully created </div> Is there a problem with the intermediary step between ALSA and pulseaudio?  It seems that ALSA will do linear pcm conversion, when the hardware does not support 24 bits when using -D plug, but does not seem to work when routing to pulseaudio.  Is this a bug in the ALSA/pulseaudio plugin? Baek