Hello!
Today, I just became a proud owner of Proteus 2500 :-)
Right now I am searching for default patches... and would like to join.
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First of all, congratulations and welcome!!
Patches (aka presets in E-Mu's terminology) are on ROMS. Generally when the E-Mu's are new, the user presets contain copies of the factory presets from the basic ROM (aka Sound ROM). If you want, you can use the front panel menu system to copy banks from ROM to User banks. A few years ago, Sean from E-Mu converted the P2K 12-controller presets (8 banks) to presets for the P2500 ROM. They should be in the files section. Both the P2K ROM and the P2500 ROM have the same samples/multisamples, so you can play the original P2K presets using the P2500 ROM. Many people find the P2500 presets superior; however, I have found a number from the converted P2K banks quite nice and have used them.
If the previous owner (or is yours new?) wiped out the factory demo sequences (songs and patterns) from the P2500, they should be in the files section as well.
You might also be interested in the P2K Yahoo group and the P2500 tutorial section over at gearslutz.
Steve