http://www.geocities.com/SunsetStrip/Studio/3507/ex800info2.html

On this page you can find a wave file containig the poly 800 mark I presets. You have to connect your computer to the tape load in and then play the wavefile.
Loading patches with the tapeload function seems to be difficult, but you can find a lot of info on the net.
On this site you can also find a MOD for putting knobs (resonance and cutoff) on your poly.

Good luck,
303bass