Whether a source port is a PHYSICAL INPUT — a preamp channel that OWNS a head-amp — as
opposed to an app or internal stream. This is the domain where the
one-physical-input-per-channel rule bites: a mono channel sources at most ONE preamp, so
phantom / pad / SENS are unambiguous, and a split of the same port shares that one preamp.
Whether a source port is a PHYSICAL INPUT — a preamp channel that OWNS a head-amp — as opposed to an app or internal stream. This is the domain where the one-physical-input-per-channel rule bites: a mono channel sources at most ONE preamp, so phantom / pad / SENS are unambiguous, and a split of the same port shares that one preamp.