Add Default GM Soundfont

[Anonymouqs]

Transferred from https://github.com/LMMS/lmms/issues/4230
Currently, there is no default Soundfont for LMMS, should we add one? And if so, which sf2 file would have a good balance of quality and file size?

There is a SoundFont called TimGM6mb that is only 6mb, the equivalent of 2 mp3 files containing average Taylor Swift songs.

Examples of the file in use are:

• 80s Flashback in a Nutshell
• Cannon in D Major

There is a list of numerous Creative Commons GM SoundFont files on Musescore's Documentation.

[WrillicR]

@Anonymouqs , thanks. Adding a lightweight soundfont is a good idea. Since it's related, I'll mention that I've been working on a soundfont pack over in https://github.com/LMMS/assets/tree/megapack, but it's not lightweight or GM (currently 250MB). If you can find some from valid sources for some GM soundfonts, I'd love to take a look at them. Keep in mind, the soundfonts must be Creative Commons 0 (https://creativecommons.org/share-your-work/public-domain/cc0/).