VLC
On Ubuntu, install VLC
via apt, not snap.
Then install the ASAP plugin: asap-vlc_8.0.0-1_amd64.deb.
On Fedora, install VLC from RPM Fusion, then install the ASAP plugin: asap-vlc-8.0.0-1.x86_64.rpm.
Formats other than SAP need to be played using
a vlc --demux=asap INPUT_FILE command line.

XMMS2
On Ubuntu install XMMS2 with sudo apt install xmms2.
Then install the ASAP plugin: asap-xmms2_8.0.0-1_amd64.deb.
On Fedora: sudo dnf install xmms2,
then asap-xmms2-8.0.0-1.x86_64.rpm.
Only SAP and FC formats are supported - XMMS2 misdetects the other formats as MP3.
Command-line converter
For command-line conversions (e.g. to WAV or between SAP and the tracker formats) and editing the metadata, install asapconv:
- on Ubuntu: asap_8.0.0-1_amd64.deb
- on Fedora: asap-8.0.0-1.x86_64.rpm
Run asapconv from the shell to see the syntax.
The -o/--output option selects the output format and is mandatory.
Other distros
Download the source code asap-8.0.0.tar.gz. Inside you will find instructions on how to build a VLC plugin, a MOC plugin, an XMMS plugin and a command-line converter asapconv.