Each figure came with its own "coded" chip generally set into the character's foot that when contacted with the "trigger" tab on each playset would complete the circuit so by then pressing a nearby button, you would hear playback of one to five phrases for that character. Unique features included audio playback from the show and the actual voice actor; placing the Homer Simpson figure on an appropriate playset would trigger the playback of a quote as performed by Dan Castellaneta on the original episode. Each playset held quotes and voice clip performances for a variety of characters so that placing the Marge Simpson figure or the Bart figure would trigger different quotes and voice clips. One limitation was that not every character worked with every playset — some for story logic reasons (character might not appear at that setting), release logistics (figures released long after a playset) or presumably for cost reasons (as each voice clip had to be approved and licensed).