Audio Loop (repeat,imitate)

May 27, 2018

-Velocity range :0.5x ~ 2.0x.
-Config velocities for press velocity button.
-Config the duration of one step of adjusting the loop start/end.
-Config the duration of one step of adjusting fast forward/rewind.
-Config the duration of pause in between the loop end and the loop start.
-Save current state when quit the app.
- Config a timer for close this program
-Add user guide.
-Fix some bugs.