asterisk users - Jan 2005 - Unable to remove Monitor IN / OUT wav files - Timing error

When I use sox-12.17.5 recording and mixing works fine but removing the
-in.wav and -out.wav file doesn't work.

When I tried sox-12.17.6 recording doesn't work but removing the IN /
OUT wav files is working.

Anybody has a similar experience. The command didn't change but it seems
to me there is a timing error:

The creation time for the file is:
Jan 29 15:30 18-20050129-152954-in.wav

The messages log is showing an error:
Jan 29 15:29:23 WARNING[3015]: Read error on sound device: Resource
temporarily unavailable

It would seems the file is still in use by soxmix when rm -f is being
executed 

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#Joseph