Did you use 15039 constantly as the value? (That should imply LSB value 63 and MSB value 117).
And does Ableton indicate different values for subsequent runs? That never happens in my SP code, thanks god. There, 15039 always gives 63 and 177 however many thousands of runs I do.
I had the code generating a random number: value = rand_i(15689)
Previously I’d had the cc’s hooked up to an Operator synth. Then I thought to use the MIDI monitor.