Rottendog is clear that MPU326 does not yet support system 7 games,
but they plan to make it compatible soon.
If you don't want to wait or get your boards fixed, pinballpcb.com sells
replacement system 7 boards.
-scott CARGPB#29
Jungle Lord is a Sys 7 game. So, whether the board works in a Sys 6 game
or not is irrelevant.
I have a sound board from pinballpcb...it's good stuff.
I've used the Rottendog mpu326 in a Firepower, and it worked fine.
Having a combined cpu/driver board is a big plus, and the Rottendog
board has all the system 3 to 6 game software on a user selectable
switch bank, which is good if your original game chips are getting a
bit ropey. But there's no need to wait for Rottendog: get a system 7
cpu board from pinballpcb.com.
It may work out more expensive because they don't do a combined power
driver/cpu board, but I've used several of their replacement boards
and they seem very reliable indeed.