For the dirty tone, the SLASH recommended settings are:
Presence: 7,
Bass: 7,
Mid: 4.5,
Treble: 7,
Output Master: 6,
Lead Master: 10,
Input Gain: 6.5.
The JCM SLASH Marshalls are used for a clean sound, too, when modified with KT88 output tubes.
The SLASH Marshall should be tuned this way for the clean tone (SLASH recommendations):
Presence: 0,
Bass: 9,
Mid: 3,
Treble: 5 1/2,
Output Master: 10,
Lead Master: 0,
Input Gain: 4.
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edit:
One of SLASH's favorite settings for lead is the neck pickup with tone control rolled back.