LB302: make filter selection sync with GUI on initialisation and preset load
Merge pull request #439 from diizy/stable-0.4

Fixes for Triple osc, LB302 logos
Export: check for end of export in ticks, not in tacts.
This works better with time signature changes.
Merge pull request #442 from softrabbit/bug440

Export: check for end of export in ticks, not in tacts.
Merge pull request #436 from softrabbit/bug433

LB302: make filter selection sync with GUI
Fix sfxr crashing on very high notes