shntool binary package in Ubuntu Bionic amd64

 shntool is a multi-purpose WAVE data processing and reporting utility.
 File formats are abstracted from its core, so it can process any file
 that contains WAVE data, compressed or not - provided there exists a
 format module to handle that particular file type.
 .
 shntool has native support for .wav files. If you want it to work with
 other formats, you must have the appropriate helper program installed.
 Some of these helper programs - notably for Monkey's Audio, LPAC,
 OptimFROG - are not (yet) available in Debian.
 .
 With the helper programs mentioned above, shntool is able to convert files
 between all supported formats.

Source package