You need to add each soundfont that you want to be able to select for track instrument under the Soundfonts tab. The “Scan Soundfonts…” button will add all soundfonts in the selected directory and sub-directories but beware: it may not be a good idea to add hundreds or thousands of soundfonts, instead use a small set of high quality soundfonts for your compositions.


Soundfonts are your best friend, because they quickly load, and do not jeopardize the stability of RapidComposer by executing foreign code in the address space of the program, like VSTi plug-ins do. The included GeneralUser GS soundfont is good quality and is suitable for starting the composition.

It is important to set the Soundfont Gain properly. The sound should not clip or be too quiet.

It is recommended to enable the Reverb and Chorus which will create more natural, not too dry sound.

Soundfonts are automatically added/removed from the 'Soundfonts' directory in
Windows: C:\Users\<username>\Documents\RapidComposerV3\Soundfonts
OS X: ~/Documents/RapidComposerV3/Soundfonts

If you copy an .sf2 file into that directory, it will be available in RapidComposer the next time it runs.

  • en/settings/soundfonts.txt
  • (external edit)