At the end of the movie when Madeline goes to see miles and finds EDGAR smashed up, he plays his song to her and she starts to cry. Miles goes back in with the axe and makes a noise when miles steps on the microphone. He flashes on the screen "Scared You" Then miles re-installs his sound card to talk. How can EDGAR play his song to Madeline when his sound card is not in the system??
ED Note: Maybe that was just the "talking" card?
llaith kindly wrote in to add: "Those early machines, Apple II era, often had a separate plug-in cards for sound and voice! I remember my best friend's one did. You can see an example of how they are often separate here