ZPM and buffered Apis

[njkke]

You know what? I started building 1590A after seeing your beautiful works...
You're my 1590A guru! 

[juansolo]

Cured it completely by doing as suggested above. A very thin piece of ali between the board and the jacks connected to ground (and covered in insulation tape so as not to short on the bottom of the PCB). No clock noise at all now.