I bit the bullet and removed L4 and L7 this morning. It is not
difficult; they are both on the back of the front panel board.
L4 on the front panel board is related to the issues some folks are
having when using the front panel mic connector with various audio
routers. It can be shorted with a jumper from pin 8 of the mic jack to
ground.
L7 on the KIO3 audio I/O board can also be bypassed for the same reasons
when using the rear panel mic jack in similar installations.
L7 on the front panel board is for reduction of noise from the RS232
serial port lines and should definitely not be bypassed!
73,
Lyle KK7P
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