Exclusive+shared IsFormatSupported across {1,2}ch x {16,32}bit x
{44.1,48,96}kHz on both minted mic pins. Interrogates the DRIVER,
bypassing every endpoint-store stamping question: what the pins truly
accept decides whether the mic leg has any coherent configuration, and
whether an exclusive-mode mono open is an escape hatch. (The pad program
made its own breakthrough with exactly this instrument on the sibling
SSS driver.)