I think TON LIN is short for TONE LINEAR, or something like that to indicate all the tone controls have been reset to their flat, i.e., linear position.
Easy way to check. Adjust bass, treble, etc., to off-center positions, and then do the TON LIN thang. If they recenter themselves, I'm right.
Easy way to check. Adjust bass, treble, etc., to off-center positions, and then do the TON LIN thang. If they recenter themselves, I'm right.
