Merge pull request #11 from soundsplosion/tg

Loop Enable/Disable
Added master gain control
Added song length function
Merge pull request #13 from soundsplosion/sp

Added master gain, song length getter
Fixed turning effect on/off, made volumes roughly the same with effect on/off
Merge pull request #14 from soundsplosion/sp

Fixed turning effect on/off, made volumes roughly the same with effect on/off