Got your Vibrobot all built up only to find there’s no trem? Try clipping/lifting pin 6 of your 8038. Apparently some will work without doing so, mine didn’t at all until I did this. Huge thanks to @DGWVI for the info!!
Can confirm, lift pin 6 (I got my IC from Robert). Just spent the better part of the afternoon checking values, probing, tracking voltages, checking connectivity, EVEN CLEANED OFF THE SOLDER MASK/FLUX which I NEVER do, and was even ab to open my own thread then I did this and all is well.