0e6561b009
Track::init() must not call `add_processor` directly. The track is not in the process graph, yet and hence various calls (e.g. lock graph, update latency etc) are not applicable. Furthermore ::add_midi_sidechain() calls IO::add_port() which takes the process-lock. The solution is to create the Triggerbox early on and let Route::init deal with it like any other internal processors.
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