920a6a46c3
When using a UADx plugin on a Mono track in Ardour, the plugin is configured to be Mono. by calling `setBusArrangements`. The call succeeds and querying the Bus layout via `getBusArrangement` as suggested by https://steinbergmedia.github.io/vst3_doc/vstinterfaces/classSteinberg_1_1Vst_1_1IAudioProcessor.html#ad3bc7bac3fd3b194122669be2a1ecc42 confirms this. The plugin acknowledges the speaker layout for both input and output (Vst::SpeakerArr::kMono = 0x80000) ``` Input BusArrangements: 0 chan: 1 bits: 80000 Output BusArrangements: 0 chan: 1 bits: 80000 ``` but UADx plugins crash later during process() if any of the lower bits are unset and the bus is enabled. PS. The plugin does NOT crash as long as a lower bit (Vst::SpeakerArr::kSpeakerL or ::kSpeakerR) remains set in addition to kMono.
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https://ardour.org/development.html