Check soundcard settings: bitrate
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To check settings for UCA202:
# cat /proc/asound/CODEC/pcm0p/sub0/hw_params
access: MMAP_INTERLEAVED format: S16_LE subformat: STD channels: 2 rate: 48000 (48000/1) <------ this changes with the input audio file period_size: 44100 buffer_size: 88200