SL Baur <steve(a)xemacs.org&gt; writes: I am not sure, but probably Sun. I am also not sure our implementation of NAS can handle .wav. .au is the standard audio format under Unix. Look at this snippet from 'man nas' Due to the nature of the file formats, only the Sun/NeXT file format can be piped through standard input and/or standard output. The convention for specifying standard input or standard output is to use a hyphen ("-") as the file name. Jan