The K5 is the most recent model with audio i/o support.
Although not all of the audio i/o code is gone, almost as if they are afeard of what would break if they took it all out.
Or maybe they just lost track of what all they put into the early devices.
IIRC, I **think** the most recent (and most expensive) KV model has a 'vibrator' in it to emulate tactile feedback for their virtual buttons.
If you PWM to that device - a person might be able to press the Kindle against their head and 'feel' the music.
People with a cochlear implant might find that interesting.
