The keyword "Portable" attached to GoldWave v5.55 is not
GoldWave is not open-source. Version 5.55 was shareware. The current developer (GoldWave Inc.) still sells licenses for v6.x. However, archived copies of v5.55 are often available on legitimate software archives (OldVersion.com, VideoHelp, etc.) as free-to-try software. GoldWave v5.55 Portable
For its time, v5.55 was packed with professional-grade features: The keyword "Portable" attached to GoldWave v5
Cannot select Stereo Mix as recording source. Fix: Right-click sound icon → Sounds → Recording tab → Show disabled devices → Enable “Stereo Mix” or “What U Hear.” "carry-anywhere" audio editor? GoldWave v5.55 Portable
[Release] GoldWave v5.55 Portable – Professional Digital Audio Editor Looking for a powerful, "carry-anywhere" audio editor? GoldWave v5.55 Portable