This library has worked for me and several others. You can setup up to two unique frequencies on several pins. Just make sure you read the notes. Give it a try. Good luck.
http://forum.arduino.cc/index.php?topic=144446.msg1149044#msg1149044
This library has worked for me and several others. You can setup up to two unique frequencies on several pins. Just make sure you read the notes. Give it a try. Good luck.
http://forum.arduino.cc/index.php?topic=144446.msg1149044#msg1149044