Digital music packs
Doom's music is MIDI-based. This means that the music can sound vastly different depending on the hardware used to play it. Most PCs in the '90s played back Doom's music using low quality FM synthesis but superior options were available. One example is the Roland Sound Canvas SC-55, a piece of professional MIDI synthesis hardware that was originally used by Bobby Prince to compose Doom's music. For this reason, the SC-55 is sometimes considered the "canonical" playback format for Doom's music.
Future versions of Chocolate Doom will include support for digital music packs: high quality digital recordings of Doom's music from devices such as the SC-55 that can be used in game in place of the normal MIDI playback. When a substituted track is to be played, the high quality recording is played instead. An example can be seen in the video to the right.
High quality recordings of Doom's music already exist, such as Brandon Blume's SC-55 recordings. We hope to provide a set of pseudo-official downloadable music packs for each of the games supported by Chocolate Doom.
The digital music pack functionality also provides a more convenient replacement for Hexen's CD music playback. Hexen was distributed on CDs with audio tracks containing high quality recordings of the in-game music. The game could then play these recordings instead of using the user's hardware MIDI playback which in the '90s was often primitive. Chocolate Hexen no longer includes CD music playback support but the same result can be achieved using a digital music pack.