removed useless comment
Merge pull request #1 from zz85/master

Change bird constructor to reuse audio context
Merge pull request #2 from zz85/master

Add Gui Controls
Merge branch 'master' into gh-pages
fixed scoping issues
added controls and randomized ifrq
fixed ui issue of automatically changing ifreq knob
fixed safari on ios issue
added more birds
added commit to choose birds
Update GUI and chirp after selecting different voice preset