# Play the desired far-end reference signal in the background
aplay <my_48kHz_stereo_far_end_reference_signal.wav> &
# Run a stereo audio capture at 48 kHz with 32b bit depth for 60 sec
arecord -r 48000 -f S32_LE -c 2 -d 60 <capture_48k_2ch.wav>
# Unpack the 48 kHz stereo packed file into a 6ch 16 kHz unpacked wav using 32b sample depth
python3 xvf_tools.py packing unpack <capture_48k_2ch.wav> <unpacked_16k_6ch.wav> -b 32