From thefinalg@yahoo.com Tue Mar 19 14:44:02 2013
Subject:Re: SK1 to Vent Wiring diagram.

Sorry - Yahoo showed your "author" name as something different than the original poster, so I didn't realize you were the same person.

In theory, as long as Pins 3 & 5 are both ground, they should be interchangeable.

There's a post below that lists the pinouts on the SK1, and shows pin 3 as the "audio ground", with pin 5 being just "ground"

http://forums.musicplayer.com/ubbthreads.php/topics/2338957/Re_SK_1_and_2_Tips_Tricks_and_#Post2338957

I don't know why they are labeled differently - I would have thought ground is ground.

Maybe there is a difference if you're using a real leslie?

Or, maybe the "audio ground" and the leslie "ground" are separated so that the leslie speed control (which switches tip-ground to ring-ground) is removed/insulated from the audio-side connection. I.e., as you're switching the leslie speed you are connecting and disconnecting things to ground, and by having a separate "audio ground" pin you have a constant, unaffected ground to the audio signal.

(Though again, I would have thought all the grounds are connected at some point...)

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