Added AudioFilterFIR which performs FIR filter
using user-supplied coefficients
Removed extraneous comment lines
Delete *.bak
Add the fir_filer sketch to the examples directory
Add chorus and flange effects and an example sketch for each
AudioSynthWaveform updated to add tone ramping when a tone starts and ends
PlayMidiTones example modified to work with ramping.
Cosmetic fix to Flange.begin
Correct the calculation of delay_rate_incr
Correct storage class of some variables in FIR
Merge pull request #4 from robsoles/master

Some filter additions, some SGTL5000 additions
Merge branch 'master' of github.com:PaulStoffregen/Audio (Pete's changes)

Conflicts:
	Audio.cpp
	Audio.h
Add an audio sweep. User defined start and end frequencies and length of time of sweep.
Fix compiler warnings
Remove debugging statement from AudioToneSweep and add ToneSweep example sketch
Merge branch 'master' of git://github.com/el-supremo/Audio

Conflicts:
	Audio.cpp
	Audio.h