Hi Chris,
Thanks for your reply. The ASIO is SB Audigy ASIO [9800] and Device ports are - L Stereo in to Analog Mix L - 1, R to Analog Mix R -2, Mono in to Analog Mix L - 1, Mono in 2 to Analog Mix R - 2. After phoning the helpline in Germany I have upgraded the system to 5.5.3, but no difference to the missing audio.
Regards, Barry.