The big problem that I see is that you're not building the kit stock. If you have any issues with this build, the only tech support we will give up front is to take the Speedball out and debug the stock circuit, so I hope you're feeling lucky!
No worries, this kit had previously worked flawlessly without speedball, then with speedball after some problems i had to fix.
I did not just skip all steps, always checked everything inbetween. Just while working on it for replacing the pot i had knicked one of the smaller cables connecting the small speedball pcb, and just replaced them all with the thicker ones for stability. I checked everything after that step.
That's a 24K resistor, don't use that.
oops, linked the wrong one.
I used a 2.4k and a 91, which works fine too.