Fixed AudioSynthWaveform. Uses LUT with linear interpolation for sinewave.
Square, triangle and sawtooth are generated directly.
Update the PlaySynthMusic example to use a floating point table of note frequencies (not divided by 2)
Change FIR filter (as suggested by rheslip) to filter one channel instead of two. Updated example, added documenting file
Merge pull request #28 from el-supremo/master

Fixed AudioSynthWaveform. Uses LUT with linear interpolation for sinewav...