Mighty Coogna!

You'd be better off building your own "Plek" machine than trying to profit from buying one. if you understand the technology behind the concept it actually very simple. - Aside from the programming.

Plek is quit overrated in my book, and suffers many real world drawbacks IMHO.

© is a copyright for the published art or lyrics, score, packeging, graphics, etc.

(P) is for performance copyright. I dont know about Phonographic. or maybe it stands for Physical , as in the recording medium. Not certian now.

The P copyright is particular to music, as i havnt seen it elseware.

As a side note a TM is for a logo or other identifying graphics and precedes a formal © copyright.

Also you might notice a SM from time to time indicating use by a govt instituion or school.