just picked up a prestine condition peavey combo 300 (90s model) for $350AU. the only problem is i didnt get a user manual, and im not a real big tech head when it comes to bass rigs, and im stumped as to what the yellow 'comp' light means. all i know is that it comes on when i slap or pop, or have alot of pre/post gain on. also, as some of you may know, it uses 210W standard, but hooking up an extra cabinet pumps it up to 300W. the extra cabinet output is rated at 2ohms, which also confuses me as all the cabinets i see around here are 4 or 8ohms. finally, what are the 'patch in/outs' and the rest of the inputs/outputs on the front of the amp? its in some strange peavey language that i cant decipher. any help would be great. thanks.