- ADPCM playback notes

  Each ADPCM format maxes out at just under a specific limit.
  If you attempt to play at the limit or faster, the decoded audio exhibits
  jitter/artifact noise as if the DSP has signalled an output rate faster than
  it decode.

  Note that the maximum discovered is almost DOUBLE in some cases the maximum
  listed in Creative's official documentation.

  4-bit ADPCM:                          Maximum just under 16KHz
  2.6-bit ADPCM:                        Maximum just under 16KHz
  2-bit ADPCM:                          Maximum just under 19KHz