-Luppp's GUI has had a bit of work
-Effect control from the APC40 has been revamped
-Effects sends have been implemented
-The GUI now shows the effects under the track, in a small widget: reasons? Now you can always see the state of all your effects, not just the ones on your currently selected track. Better for live situations!
-The APC40 has 8 buttons under the Device controls, they now each map to Effect on/off. They're labelled for a different purpose, but I find this use quite intuitive.
-Post fader sends are implemented, including widget representing the state. The GUI widget doesn't work yet (ie won't change the value) but it does update upon a controller change.
I've pushed the changes to devel, but also the master branch, AFAIK its stable.