I am considering purchasing one or more of the following RAM cards for the SY77: 90 POP, STUDIO PLAYER, EUROPEN CHART, SHOFUKU, BEST OF DX1, BEST OF DX2, JSPA1, JSPA2. Is there anyone out there that is familiar with any of these cards? I would like some feedback on their content to aid in my decision of which card(s) to purchase. I already have the Sax, Classical, and Organ cards.