Bypass is set on thru.
I hear it on the 5th and sixth string with several guitars.
When I turn on the drive it's more clear.
On/ off with the MFC
It's likely an issue somewhere else. I can hear it only on certain notes in your clip. Something ringing in the room? Guitar needs setup or bad electronics? It sounds like an octave-type effect, but it doesn't sound like what the pitch block sounds when it's active.