Since the input and output streams were merged into a single
virtio-sound device, playing audio in the guest also opens the host
microphone, which switches Bluetooth headphones into headset mode.
Replace the "Enable Sound" toggle with a choice of input only, output
only, or both so users can avoid opening the microphone.
The existing "Audio" key keeps meaning output and a new "AudioInput"
key is added. When "AudioInput" is missing it defaults to "Audio", so
existing configs keep both streams and new configs still load on older
versions of UTM.
Resolves#7875
Assisted-by: Claude:claude-opus-5-5
osy
e50840634f