That's fair enough R.G.
So far, these are "esoteric" adjustments. I mean the unit works as advertised, which is of primary importance, so I'm not really sweating this small stuff. I'm already getting used to the quirks, so it's no biggie for me. If there is a simple fix, then go for it.
Or, we leave it as is. That should cover the "quirky mojo" aspect for the clone
Speaking of which (I forgot to mention this before), when I put my Fuzz Rpt./FFM switch to "Both", both colors of my bi-color LED are on. Tracing the circuit, I can understand why, but I might suggest that the builder be judicious in choosing the bi-colour LED here. Mine doesn't give much of a visual difference between the red/green together, and the red alone. It's very subtle, more orange than amber.
Here is my "quick and dirty" setup guide for adjusting the trimmers and pedal pot in the clone.
First, some ground rules;
1) I used a Crybaby shell for the pedal, along with a P.E.C. 10K pot. The pot fits well, and is pretty well bulletproof. There are rubber bumpers on the treadle, which cushion the impact between toe and heel down positions. I trimmed these to about 2mm with a razor, to maximize the sweep, yet retaining some impact cushion.
2) I used a BD679 power transistor. All the information below relies on having 48vdc +/-0.1 power supply voltage, and 35.6vdc +/-0.1 at the emitter of the BD679. If your voltages are further from these numbers (within reason), then your pedal will probably not sound quite like mine. This is normal, and nothing that some fine tuning thereafter can't adjust. Like I said, this is to get you close to where you should be.
3) I used 1% metal film resistors, and metal film caps. One exception is the 220pF cap, which is silver mica. I'm not quite sure if that makes much of a difference, but I thought I would throw that out there for good measure.
Now the setup;
1) Install your pot in your pedal. One pole goes to ground, the wiper should be on this side of the pot when in toe down position. Adjust the pot position so as the pot sweep is completely at the end of it's travel when the treadle is completely heel down. In other word, bottom the pedal, bottoms the pot. If you wish, you may also trim the rubber toe/heel bumpers, if you're using a Dunlop type shell, to maximize the amount of sweep. If you do, you can take them down to about 1/8" (3mm), which is enough to cushion the impact. In any case, assure to leave a bit of play on the pot rotation in heel down, to accomodate the deflection of the rubber bumpers. This will avoid having the rack gear jump a tooth if you push heel down too hard.
2) Once the boards are installed and completely and wired, test your power supply, and power transistor voltages. If you're good to go here, proceed to the next step.
3) WITH THE POWER OFF
- Adjust the trimmer resistances to the following numbers as illustrated below. If a trimmer seems to drift on the meter, just sit tight until it stops moving, and then adjust. Two lines point to where you should probe the trimmer, with the desired resistance. Since R55 and R77 are in a voltage divider mode, probe one side of the trimmer, then the other. Note as well that R31 will vary with pedal position, so I've given the resistances in toe, and heel down positions.
4) Fire up your unit. One thing that both the clone and the original have in common is the RF29 voltage. Both seem to like 3.80vdc on the wiper to ground. This gives the best vocal quality from all modes. If you're within 0.5vdc of this number, you should be in the park. Just tweaking the trimmer a bit will give noticeable results, so keep track of your adjustments.
5) RF55 and RF77 adjust the F1 and F2 frequencies. You can play with these, again, keep track of you adjustments. You'll see that adjusting one or the other will shift the frequencies, thus changing the vocal qualities of the unit. Keep track of what you're doing, and adjust these to taste if the initial settings don't meet with your satisfaction. A word of warning though, going to far one way or the other, with either trimmer, will send the unit into bad oscillation, give you bad thumping when switching, or thumping when sweeping the pedal. So, go easy!
That's it. That's how mine is set up. If you can get close to the numbers above, you should be able to avoid any bad oscillations or thumps, and get some decent vocal action going.