- Remove vestigial lufs_meter_widget.py and debug_audio.py - Delete unused WaveformWidget/WaveformMonitor classes, dead stubs, duplicate code - Fix turn-mode deck crashes (deck3/deck4 missing from engine.decks, uninitialized manual_elapsed/duration) - Replace raw print() with logging in main.py - Add master_volume MIDI learn signal + settings popup entry - Bump version to 0.5
TopBarWidget already connects mapping_learned to _on_mapping_learned internally in set_midi_engine, so the external connection in main.py was both redundant and referenced a non-existent method.