On Sony Micro component sets like the 5 disc CMT-HP* the remote has a pause CD play function button with a symbol like a quotation mark between the start and stop buttons. On the unit itself pressing the chose CD function button (there is also a choose Tape and choose Radio button) while a CD is playing will pause the player. Press it again will resume play.

Don't know how widespread these functions are on any other products from Sony or other brands.