monitor follows the master bus outs,
auditioner is fixed stereo and synth dependent.
(fixes crash when adding/removing the monitor section)
if (boost::dynamic_pointer_cast<Delivery> (*p)
&& boost::dynamic_pointer_cast<Delivery> (*p)->role() == Delivery::Main
+ && !(is_monitor() || is_auditioner())
&& ( _strict_io || Profile->get_mixbus ())) {
/* with strict I/O the panner + output are forced to
* follow the last processor's output.