Hi all, new member here.

So I bought a Roland TR-707 with two issues:

1/ There's this weird crackly noise that comes out of both the headphone jack and the main L+R outputs. However, the individual instrument outputs are fine.

2/ At some point in this beast's history, someone has tried to mod it. There's this 15-pin jack coming out the back. Anybody have any idea what this mod might be Can I take advantage of it Might it be related to the problem of noisy main outs If I wanted to undo it, would that be onerous

Here are a couple of pics of the jack:

http://i250.photobucket.com/albums/gg241/monkslut/707-1.jpg
http://i250.photobucket.com/albums/gg241/monkslut/707-2.jpg

Thanks in advance for any light you might be able to shed on this!
ryan