OK, what I sent you was this (won't let me submit my edited pictures, so I'll do best I can without them):
You can install four DPDT, center off, momentary toggle switches. Do an Amazon search for such "dpdt center off momentary toggle switch" you'll come up with something like this:
https://www.amazon.com/Twidec-Moment...s%2C86&sr=8-10
Wire four of them them to your jacks, using pins 1, 3, 5 and 7 (LF, RF, LR, RR) for each. I'll address the LF jack, using pin one, other four are same, substituting pin one (for 3, 5 and 7).
Wire the two center terminals of the switch to 12VDC. Then one terminal on the end to pin 11, other end (same side of switch) to pins 9 & 11. The other side of the switch, wire to pin 1 (both ends).
This effectively puts power to pin 1 and 11, it goes down. switched the other way, puts power to pins 1, 11 AND 9, it comes up.
Make sense? Many ways to do it, several types of switches. Hopefully this gets you on the right track.