Is there a single node that can read the sd card and play the sound out the Pi's audio connection...the answer is no. Is there a node that can read the SD card - the file-in node should do that. Is there a node that can play sound on the Pi, Click on the flows tab at the top of the forum and enter 'sound' and see what you com up iwith. Then try some and see which you like (or works or you).
If you look the Projects section of the forum you may find some examples. I have one (Music Player v1.0.0) that uses a pi to play music thru a HiFiBerry MiniAmp hat.
