MSHV-Mac — native macOS port of LZ2HV/MSHV

Native macOS port of LZ2HV's MSHV multi-mode weak-signal program (FT8 / FT4 / Q65 / MSK144 / JT9 / JT65 etc.). Apple Silicon and Intel; verified end-to-end against a FlexRadio 6000-series via AetherSDR's TCI bridge for both RX and TX, with WSJT-X-compatible UDP broadcast feeding RUMlogNG's DXSpots window.

Self-contained .app bundle: PortAudio audio backend with Float32/Int24/Int16 fallbacks, FlexRadio CommonRadioAudio + DAX support, real host_processor_info CPU sensor, dark theme, app icon, font defaults. User state lives under ~/Library/Application Support/MSHV/ — replace the bundle and callsign, QSOs, logs and WAVs stay put.

Developer-ID signed + Apple-notarised, so Gatekeeper passes without the right-click dance. Patches sit on a _MACOS_-conditional macos-port branch on top of upstream main, so Linux and Windows builds remain untouched and new LZ2HV releases merge cleanly.