Error connecting AudioIn with FFT

hi guys! I noticed this (don’t know if is important)
Opening a Patch with AudioIn (DShow9) connected with FFT (DShow9), there is this error on the render TTY
00:00:02 ERR : There is no common media type between these pins.
00:00:02 ERR : The operation cannot be performed because the pins are not connected.

provaERR.v4p (1.3 kB)

as long as it works for you this is not important. the system just tries different ways to connect those pins until there is one that works…