Setting the gain of Jeff Rowland Model One

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I want to set the gain of my Jeff Rowland Model One amplifier.
I have removed the driver module from the main board. As described in the user manual, the back of that module shows some sockets meant for jumpers (see attached picture).
Unfortunately I don't know how to place those jumpers to set the gain at 20, 26, 29.5 or 32 dB (the values indicated in the user manual).
Can anybody help me?
Thank you!

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Parts Connexion

Topic - Setting the gain of Jeff Rowland Model One - gionabolle@gmail.com 23:13:24 07/22/14 (2)

As others have said, I'd contact the MFG, but... - David S. 14:32:24 07/23/14 (0)

RE: Setting the gain of Jeff Rowland Model One - jsm71 07:02:17 07/23/14 (0)

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