hello,,new to all this,,,so if i am in the wrong place imm sorry,,,,but i need HELP,,,i have an older pioneer audio/video/multi channel recver,,,lost owners guide,,,and the only way to change settings ,is through an remote,,,,,i tyyed 4 remotes so far but the code dont enter,,,,can some one have any ideas on how to get in to the settings,,,pioneer,vsx-d557,,,thank you..