Changed the UI.
If the Midi file is SMF compatible, the sound corresponding to the instrument will now be played.
Added auto play mode to preview the song.
Added the ability to select your own instrument to play.
Fixed some bugs.
The number of history folders is now limited to 100, and the oldest ones will be deleted when the number exceeds 100.
Added the ability to scroll through songs.
Added the ability to select a channel to play on.