Odd lengths are due to special processing, e.g. to remove blank passages, and output
at 64 kbps. Thus tape 21, side 1 is still only 2 hours, despite its size of 60 Mb.
Tape 21, side 2 (unprocessed) is also 2 hours, even though its size is 30 Mb.
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The Perl License, a copy of which is available via: http://dev.perl.org/licenses/