Joining a P.R.O after making sales

I want to join a P.R.O as I feel like I should’ve done a long time ago. My only concern is that this might affect customers that have previously purchased my music (if they specifically bought it because it was non-p.r.o.).

Should I only register music with no sales or just music I create after joining the P.R.O?
Any advice is appreciated!

Here is the answer: The AJ Community Guide #2 - Performing Rights Organisation Royalties (PRO)

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