merged from lp:mixxx
added gain knob and a basic LED mapping
include saved build falgs from custom.py in branch virtualization
Merge branch 'master' into rmx2
Improve vinyl absolute mode a bit
clean up EBSL a bit
more cleanup
Dynamically create pitch ring based on RPM
fix some bugs in pitch ring calculation, make it less sticky.
explain choosing 20ms latency
small lint fixes
address notes:
properly delete m_pPitchRing
eliminate redundant if statement
Merge pull request #68 from ywwg/vinyl-abs-fix

Miscellaneous improvements to vinyl control and linear scaler
Merge pull request #72 from daschuer/rmx2

Rmx2
Merge pull request #60 from daschuer/custom_virtualize

include saved build falgs from custom.py in branch virtualization
Merge remote-tracking branch 'upstream/master' into features_loop_recorder