This breaks MIDI files that have events ordered On,On,Off,Off, and only fixes
the "malformed" On,On,Off. Correct fix requires collecting all events occuring
yat one time, sorting into Off,On and then merging.
This reverts commit 5c3e5f9afb.
We no longer store nascent notes when noteOn is received, but wait till noteOff arrives. We also
ignore all other noteOn events between the earliest received and the noteOff.
Potentially we may want to use the _overlap_pitch_resolution member at some point
to offer control of this behavior.
These are longer be used since Seuqnce has a "force_discrete"
boolen that needs to be taken into account in addition to
user-configurable ControlList _interpolation mode.
