Expose current buffer for visualisation/waveform rendering

[pke]

Would it be possible for the library to expose the currently played buffered bytes so they can be used for visualistion like waveform rendering or WinAmp style visualistion plugins? They used 576 bytes of buffer to create amazing visualisations.

[bsneed]

Not sure if you still need this, but I need it too and am working on adding it to my fork.

[pke]

Sure. Will check it out

[bsneed]

See #80