fixes
man audio class is more paranoid / reliable for whatever curves. need to check channel handlers again
engine seems good... one bug that may have been confusing things is that the widgets don't mean anything until they are actually touched... so initially you're selecting nil. linux and mac SC seem to have different behaviors for uninitialized variables... so this behavior was hard to predict.
clean up WaveTravelVoice and add arbitrary audio output bus offset for scoping/whatever.
add playback group to WaveTravelVoice for processing order in scope/monitor/etc