NB! It seems this console command is not compatible with CS2.
Command Profile

VOICE_RECORDTOFILE

CS:GO

This command, if enabled (1), will record microphone data and voice data to the files 'voice_micdata.wav' and 'voice_decompressed.wav'.

Syntax
voice_recordtofile [0 / 1]

Description

This command, if enabled (1), will record microphone data and voice data to the files 'voice_micdata.wav' and 'voice_decompressed.wav'.

Syntax And Arguments

voice_recordtofile [0 / 1]
0 / 1 Set to 0 to disable recording to file (default). Set to 1 to enable recording voice to file.