PatternControlSource

From Buzztard

Right now (0.5) we build complex envelopes for each machine-parameter that has pattern events. It requires a complex logic for updating parts of the evelope when changing patterns. The biggest downside is that e.g. inserting a line in the sequence or changing the tempo, leads to rebuilding all envelopes.

A better way to implement it would be to introduce own control sources. Those would access the sequence and patterns to produce the control-changes on-the-fly.