by crochambeau » Mon Sep 04, 2017 12:17 pm
There's only a wiper lead to your volume?
On your schematic rendering there were incomplete leads between the tone and volume control, if you're wanting to wire that off board to allow for the different functions you mention, you'll still want to terminate those nets onto a pad, I generally grab single pin connectors when I do this sort of thing, but it's MUCH easier down the road if you draw everything correct and complete, and then shoot off some utility connection points in case you feel like getting kinky.
A poured ground plane is very good practice with a lot of high frequency stuff, not so much audio bandwidth unless your circuit is susceptible to RFI. That said, I have stopped doing them for the following reasons:
1) it's easier to inspect the board with the back light method if there isn't a wall of copper in the way.
2) it's easier to R&R parts that connect to the ground plane when there isn't a big thermal mass wicking heat on that pad, but I do a lot of fine tuning/value selection on a finished/early rev PCB as part of my prototyping work flow. This is probably not as large a concern on an established design... but it will also make repairs easier.
So keeping the copper fill is not a bad decision; HOWEVER, if you do I would highly recommend manually laying a ground trace before filling, as it makes spotting unassigned connections (like at tone & volume) easier.