Audio on the Toshiba/RRD43 CD-ROM

Merry Christmas everyone, and for those who don't celebrate that particular event, Greetings, I've put an RRD43 that was apparently scavenged from DEC system long ago into a shiny new enclosure with a removable disk drive. Yes the RRD43 is only 2x but it is "known" to DEC hardware and you don't need a caddy with it. (On a related note I now have a 1x VAX compatible (RRD42 like) CD-ROM drive available for trade that does take a caddy :-) I'd like to connect up the audio outs for completeness and I've run into a snag, no docs on which pins are what. The Toshiba mechanism is the XM-4401B and all the web references I have found on it only describe the speeds etc but not the pin out of the audio connector on the back. It is a white connector with four vertical pins on the left side (when looking at the SCSI connector). If anyone has this information or a pointer to it that would be great. --Chuck