Here are fixed versions of sfconvert and aifcresample for IRIX 5.2 and 5.3.
IRIX 5.2's sfconvert had a bug in the sampling rate conversions.
IRIX 5.3's sfconvert and aifcresample had minor bugs in 
output amplitude and latency.

To install (as root):

    (remember to fetch the .Z files in ftp binary mode)
    uncompress aifcresample.Z sfconvert.Z
    mv aifcresample sfconvert /usr/sbin

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    revenue or profits or other special, indirect and consequential
    damages, even if Silicon Graphics, Inc.  has been advised of the
    possibility of such damages.