There could be a better way but my approach would be to try PositionToTile where it would convert the player's position X,Y to a specific tile position, with which you can grab the TileID using 'Compare tile at' position. This should in theory give the ID of the current tile that the player is overlapping and then you can say for example if ID=1 play audio1, give it a go I kind of want to try it myself but too lazy to set up a tilemap :)