Added 22 new songs spanning gothic organ, Celtic folk, space ambient, industrial metal, jazz, military march, percussion showcase, and more. All use advanced synth features: expression swells, sustain pedal, pitch bends, modulation vibrato, detuning for microtonal color, stereo panning, reverb/chorus, and drum grid patterns.

Rewrote all 20 original songs (excluding Test Scale) with multi-section structure (A-B-A, verse/chorus), track options, and control events. Songs that were 25-35 lines are now 80-210 lines with real dynamic variation.

Fixed MIDI event timeline sort: note-offs now reliably fire before note-ons at the same timestamp, and sustain pedal OFF sorts before ON. Prevents notes from compounding when sustain cycles rapidly.