Besides, the gravitational tides created would have ripped the planet to pieces long before it came in audio range anyway, I would have thought.
No they wouldn't... at first.
It's the frequency that matters more to audibility, not amplitude in itself... mechanical wave motion that can be heard as voice does not really need to be that strong in terms of actual power input. A very modest speakers can be used to propagate wave motion through air to ear. But in this case, obviously your ear would be vibrating in and itself, you could hear
this voice even in perfect vacuum for the brief period of consciousness you would last there.
If the rotation cycle of the black hole pair would be in human hearing range, the alternating gravitation field would indeed cause global (or should I say, helical) mechanical wave motion in everything in the solar system, first with extremely low amplitude (and thus low audio intensity), but as the pair would close up, the intensity would magnify and you would be able to hear it.
Obviously, when it would get really up close and personal the high frequency tidal waves would cause a shattering mechanical wave motion generated by ripples in space and time that make the matter contract and squeeze with so much amplitude that it would practically first disintegrate the solar system, then heat the powder to extremely high temperatures, melt the molecules, destroy the atoms and who knows, perhaps even the protons.
So if the rotation frequency was anything from 20 Hz to 20 kHz, then at some point the vibrations caused by the gravitation waves would indeed be heard, until the volume would go south-east and beyond, so to speak.
