Safari playback bug - clicks, etc, play at higher than nominal frequency

[jrkatz]

Click sounds on safari sound higher than on chrome and firefox, as if they're being played back slightly too fast.

On my macbook, the default sample rate is 48000hz. Both the offline audio context and resulting buffers have this sample rate when the click sounds are created, and the audio context for actual playback is also played at 48000hz. That leaves a few options for what's wrong

Safari bugs:

1. The oscillator node is buggy, and assumes 44100hz so it plays slightly too fast at 48000hz creating a higher tone, or
2. The offline audio context is buggy and downsamples to 44100hz when making the buffer, but still lists output as 48000hz, so when played back it is played slightly too fast, creating a higher tone
3. Some other mismatching sample rate issue

etcnome bugs:
4. I can't rule anything out.