While it's a relatively small issue and doesn't affect gameplay, per say, it is annoying as hell. Every time I turn on my POTC JJP machine I am reminded of this issue and have to hear the annoying sounds. I could care less about the "pop" that all games have, although I want to find a global solution to that as well. I'd just like to know if I am unique in this situation and/or if anyone has any tips. I've sent this off to JJP support and we've tried a few things. I've switched 3.5mm cables from the mobo to the amp. I've tried the inline ground loop isolator from my WOZ (bypassing the one in POTC) to see if that might be at fault. I tried unplugging the headphone header from the mobo (JJP support suggestion) to see if that was causing any issue. I traced the audio cables, trying to move them away from anything interfering, reinserted them, etc. Nothing here has solved the issue.
Something else, which I am not sure is related or out of the ordinary, is "chirping" that happens occasionally when the game is sitting idle. I posted a video below where you can hear it but you have to listen between me brushing the mic with my hand. It happens a few times.
My only close to a resolution situation has been to devise a delay timer that disconnects the speakers at power on and waits for X seconds to reconnect them. I am still working on this, and it seems like it could be a solution for the pop as well, but it seems like a bandaid which may my indicative of other issues. What if the mobo is going out and this is a sign? Etc.
Has anyone seen this in their JJP game at all?
While it's not done by any means here is an idea of what the timer does... and you can see, when it times out the speakers come to life and the whining continues: https://photos.app.goo.gl/N6ui8G3GHgzRueqf9