I got this amp but I can't find any information anywhere about the type of footswitch it takes. Everything I've found says to use a FS-22 switch and then mod it to a FS-36 by using a 4 conductor wire to a female XLR connector. The problem is my amp doesn't use XLR for the footswitch. There are 2 quarter inch jacks for this purpose. Does anyone have any information about this amp? Even Carvin doesn't have any user guides. I think this amp was made around '83, but I really have no way of confirming this. Thanks.