new sounds and footer
hihat stopper
song persistance
better tempo adjustment
changed some styling
auto tempo update
change beat count and cleanup function
addming angular favicon
greying out used instruments:
changed share link btn
better json output
test play
keyboard
fixed keyboard stuff
error on invalid url
back and forward keys
changed some more movement stuff
Keyboard control and editing. correct ordering of channels
more buttons
better default track and better keyboard navigation