Master tracks the default sink (HDMI, the jack, a Bluetooth headset) only while
its wiring is the one autoroute made; anything else (qjackctl, several sinks)
is custom and left alone, and disconnecting all of Master's outputs hands
control back. The new link is made before the old one is cut. The default-sink
lookup runs every 2nd tick, not every tick.
SuperDirt takes no mic: capture -> SuperCollider:in_* links are cut, with
TIDAL_AUTOROUTE_SC_MICS=1 to keep them, documented in the script header.
