The synch process will just look to update any changes so if you remove items from your Mac or add tthem that is what the synching will do. Of course you can set yur ITunes to automatically update or or only manually in which case if manually it will only do wht you tell it to -----Original Message----- From: adaptivetec-bounce@xxxxxxxxxxxxx [mailto:adaptivetec-bounce@xxxxxxxxxxxxx] On Behalf Of Claude Everett Sent: Saturday, March 30, 2013 2:11 PM To: adaptivetec@xxxxxxxxxxxxx Subject: [adaptivetec] Making the transition After a lot of trial and error, I was able to sink the music on my Mac laptop to my IPhone. I wonder if when I sink in the future it will ignore any music that is already on the phone. Regards, Claude Everett "A corporation is "an ingenious device for obtaining profit without individual responsibility." Ambrose Bierce