The MY MIDIFILES folder in EZplayer is where you can save your MIDI files you sequence in the Arranger section of EZplayer or any MIDI you want to appear in your EZplayer browser.
Saving a project in Solo (.tts file) is a save file unique to Solo and saves the entire state of Solo. IOW, it will save the sampler you have loaded (EZD, S2) as well as any arrangement you have in EZplayer that is active in Solo.
