SimpleCast 0.9.0 beta 13

Beta 13 adds direct audio capture from a chosen Windows program and mixes it
with the selected recording device for karaoke and live performance.

What is new

Keep a microphone or mixer selected under Recording device, then choose
an optional second source under Program audio.
Capture Chrome, Spotify, KaraFun, VLC, or another running program through
Windows WASAPI process loopback.
Child-process audio is included, which supports multi-process applications
such as web browsers.
Recording-device and program audio are mixed into one stereo signal before
metering, processing, sound testing, recording, and multi-server broadcast.
Independent 0–200% volume controls make it easy to balance a singer's
microphone against karaoke backing music while live.
Saved programs are rediscovered by executable path when their process ID
changes.
The interface explains when a saved program is closed or the Windows version
does not support per-process capture.

Program audio requires Windows build 20348 or newer; Windows 11 is
recommended.
A selected program must remain running. If it closes, SimpleCast reports the
stopped source instead of continuing an empty broadcast.
DRM-protected playback may return silence.

All automated tests pass.
The native x64 capture helper builds with Visual C++ and the Windows SDK.
Real process-loopback PCM capture was verified at 44.1 kHz stereo.
Automated PCM tests verify stereo addition, mono microphone duplication, and
safe clipping at full scale.

The binaries are intentionally unsigned. Windows SmartScreen or Smart App
Control may display a warning.