presence knob on a marshall 3560?

[slantedpanted]

Well i wanna know what i does - it seems like the sound brightens - but what does it regulate? Its not part of the eq "panel"

[bongomania]

"Presence" is almost always an EQ control that boosts the highs and high mids. It may not be part of the EQ panel, but it's just another EQ.

[The.Marius]

http://www.marshallforum.com/marshal...dsl-again.html

"Presence reduces negative feedback in the power amplifier section to provide a small amount of boost at frequencies above the treble control."