New Audi addition to the fleet (and radio code HELP!)

[only5kgt@uswest.net]

Greetings listers,
This holiday weekend my sister traded her Saab 9000S in for
a nice '93 Audi 90S... she's very pleased  with the car. The
radio code is giving me fits, because although I have a code
tag with a four-digit number, the radio (stock Gamma) won't
accept it... think that 1249 can't be entered on a keypad
which goes only to 4, anyway. I don't have the supplement
which deals with radio operation... anyone out there
unlocked one of these (I'm sure...)??
Regards,
Rob
'87 5kcst (RIP)
'85 CGT
'93 90S (sibling rivalry)