Hi,

There have been a number of post with respect to voltage dividers for the (4V and 1V) outputs
This is required when connecting to input stages (amplifiers or aux) that require a voltage different
than what is available on the empeg. When doing this it is best to somewhat match the impedance
of the input and output stages. If an output stage drives a high Z it may be noisy or worst, if the output
is driving an input Z that is too low you could (will) cause damage to the output stage.
(Hence, do not drive headphones with the empeg outputs!)

One of the post mentioned 10K Ohms pot, this is almost always a good place to start in audio.

Have Fun,
BillA.