I searched this on line and found a few "speed calculators' to set the slap back speed. I play by ear and don't care for any of that stuff. Do any of you have a rule of thumb for setting this on the fly? I can get it to where it sounds good to me but wondered if there's something I'm missing. It's funny, If you don't get it it fast enough or too fast you don't hear it at all!.....Did I just answer my own question? :-)
Some folks are into calculating delay speed to match the tempo of songs, but like you, I dial in my delay speeds to whatever sounds correct to my ears.