Most elements in MuseScore are laid out automatically but can also be positioned manually. The capabilities of MuseScore can be extended via plugins, and the growing repository on musescore.org contains many plugins submitted by users. MuseScore includes a set of sounds that reproduce common instruments (as defined by General MIDI) without taking up a lot of disk space or memory, but you can also substitute any SoundFont you prefer for a wider variety of sounds or for more realism.