[LAU] Input to aplay to make a file instead?

I use a program which plays regions of various .wav files. Its
output pipes into aplay like: '| aplay -f FLOAT_LE -c 2 -r 48000'

To where can I pipe its output, instead, to make a new .wav file,
or make a compressed file? Preferably faster than the region(s)
take to play.

Or, if not, make aplay write to a file instead of playing?

Thank you.

-- 
John.
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