The Fluid Soundbox, the second full-length album by Ernest Maeschi and Karen Diblitz, is chock-full of '50s and '60s-inspired instrumentals, albeit done with late-'90s flair and flourish. According to their original label, "delving into the backgrounds and personal lives of the intensely private Maeschi and Diblitz was difficult, and to be honest, their lifestyles make them sound like international jet-setters…