I'd not depend on VM-not-knowing-the-sound. While it could be achieved
initially, I think it will eventually leak into VM. For example when
user assign a microphone to a VM.

at least the issue of data leaking via microphone could be fixed by disabling microphones during playback.

but i guess this could be impossible, since there is strange USB-hardware and detecting a microphone could be very hard.

but anyways i think allowing the user to supply a custom sound or to record a voice clip would: * add security, since detection of a [few] second[s] signal should be less error prone than detecting a signal shorter than a second. * improve usability, since voice is easier to recognize than some beep meaning "blue vm activated".

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