Loved my Ripper and found the positions #1 and #2 on the rotary worked best for me, although #3 sounded better when I used a Mutron III. It's a matter of taste. Strung with Rotosound Swing Bass, it is still one of my favorite sounding basses. I bought it because my '59 P bass developed an untreatable buzz from its pickup and the Ripper was the Gibson that sounded most like a Fender. Never liked another Gibson bass before or since. I had a black '75 one like yours. Sold it after I got a Steinberger L2. Picture shows what the rotary does.