I have now finished building the noise section of the Yocto. Pretty straight forward to assemble, but I hade big problems calibrating the AC RMS output to 130mV as instructed in the build guide. After searching the E-Licktronick forum for help I tried some suggestions of switching some resistors to other values but to no avail. I found some references to the Roland TR-808 Service Manual (page 15, Mainboard change 5) which had a suggested change for the noise section. I found the manual but I was not really sure how to implement it, I was a bit confused by the 22pF cap. Then I found the Masuto Yocto 808 Building Tips which guided me in the right direction. After implementing this it was possible to calibrate it properly (at least as far as I can tell, perhaps my multimeter is not that good).