Resolve a strip's audio insert point (source + sink port pairs). The default
(defaultInsertPoint) maps an input channel i onto the stereo
system:capture_{2i-1,2i} → system:playback_{2i-1,2i} seam; deployments with a
different JACK/PipeWire port layout inject their own.
Resolve a strip's audio insert point (source + sink port pairs). The default (defaultInsertPoint) maps an input channel
ionto the stereosystem:capture_{2i-1,2i}→system:playback_{2i-1,2i}seam; deployments with a different JACK/PipeWire port layout inject their own.