GDM

The GDM (General DigiMusic) format is a sample-based music format similar to MOD, and is unique to the BWSB sound library. GDM is well known among MZX'ers due to the high number of songs converted to this format for purposes of being used in MZX games.

The DOS versions of MegaZeux included a program called 2GDM, which converted most MOD and some S3M songs into the GDM format. As MegaZeux didn't natively support S3M music at the time, 2GDM was often the only way to allow a song to be used within MegaZeux.

Since version 2.80, MegaZeux is capable of converting GDM music back into S3M at load-time, so that this music can be played back using the ModPlug and MikMod libraries used in the ports.