Individual outputs can be sourced from the points shown on the picture below. Ideally the jumper wire should be removed, and the output should be wired to a switching jack. The other side of the jack switch should be wired back to the mix bus i.e. where the other end of the jumper wire was soldered, so that the sound is removed from the mix output when a jack is plugged into the socket.
J7 on the bottom right connects a lower level submix of the hats and snare noise directly to the main output. This submix bypasses the accent circuit.
This means that the hat and snare won't be entirely removed from the main mix if J3 and J4 are removed, so you might want to wire a switch across J7 so you can mute this submix if necessary.
There will be a little crosstalk between the hat and snare individual outputs as they both use the same noise source.
EDIT: THIS WAS FOR THE ORIGINAL RUN OF PCB'S. THE LATEST VERSION HAS A SLIGHTLY DIFFERENT LAYOUT THAT MAKES THIS EASIER. SEE THE BUILD GUIDE FOR DETAILS.