advanced codes for NAD 248 reciever 

 187 on off
 060 Vol up
 061 Vol down
 175 Video 1
 173 Video 2
 177 Video 3
 149 Video 4
 153 Video 5
 192 Cd
 193 FM
 111 Channel up
 113 Channel Down
 191 AM
 063 Tape mon
 086 Ext 5,1
 044 Surround mode
 213 Sleep timer
 048 Test mode
 218 Up arrow
 085 Down arrow
 089 Left arrow
 087 Right arrow
 151 Enter
 124 Mute