I've tried those methods, and it just acts like a normal pixel of METL with BTRY next to it.
EDIT: Well, now I feel really dumb. I've been trying to copy the design that DS66 uses, and the ctype of the CONV is set to SPRK. Thanks everyone!
EDIT2: If I use PSCN instead of METL, it doesn't conduct to ARAY.
Ah, with the 60Hz solid spark setup, the CONV must be set to the ctype of the element you are trying to spark. The quickest way to do this is select the METL or PSCN element and directly click on the pixel of CONV. Press 'D' to open debug mode and you should now be able to see things like CONV (METL) instead of just CONV.
LBPHacker's link to mniip's explanation describes the fundamental sequence for making solid spark work using the 'modern, classical method.' This is what I wrote on it. A more paragraph form explanation starts under "What is A3SFTT." You will also have to save and reload the save to guarantee that all particles receive the correct particle ID.
Summary: