I have determined the location of the "snoring" sound. There is a flat plastic
part which has a piece of rubber-type pad on one end and about 180 degrees
on the other end is a spring; this flat plastic part has a pivot hole in between
the two ends. The "snoring sound is coming from the rubber-type pad which
is held against the supply spindle, on the same surface that the brake strap
rides.

I removed this flat plastic part and the "snoring" sound is eliminated. But
this flat plastic part is required, because the the rubber-type pad is used
to apply drag against the supply spindle during sudden stops (such as
during fast forward or rewind).

There is no visible wear on the rubber-type pad or on the supply spindle
surface which it rides. I cleaned the surface of the rubber-type pad with
a pencil eraser and that did not change the "snoring" sound problem.
I thought about putting a oil or silicone lubricant on the pad surface but
that would also affect the function of the brake strap since both ride on
the same surface of the supply spindle.

Suggestions would be appreciated.