Audacity 4.0 beta releases with Qt interface and new audio tools

Audacity 4.0 beta launches with a Qt-based interface replacing wxWidgets, maintaining the same audio engine via au3wrap. New features include drag-and-reshape envelope tool, spectral editing, metadata editor, lead-in recording, multi-project support, and cloud saving via Audio.com. Projects open from Audacity 3.0 with clips and tracks preserved.