-- Docking window for CB's to right of machine view

-- Control widgets should assume current parameter values of machine it's being
created for. This will require the current-params mechanism to be in place. 

-- On middle button, separate hit test for triangle coordinates... check to see
if mouse cursor is within certain distance of this triangle. Do them backwards
just like with machine hit test. Popup window holds mixing object? 

-- Widget builder in control_box module

-- Instead of replicating control widgets for every track, how about offering a
spinbutton to control what track param changes go to? 

-- Update copyright notices

