Some headway despite the heatwave.

D espite this intense heat, I managed to make some progress on my developments. And to kick things off, a magnificent failure. Well, it's still progress, I suppose. This concerns the USB expansion board for the Akai S5000/S6000 sampler. My first prototype doesn't work at all. Mind you, that does make it easier to find the cause. I did indeed make a beginner's mistake on the PCB. It's so obvious,…