Problem solved! Fortunately I have Picture in Picture on my Avant. Set P in P to switch between DVD and a Freeview BBC radio station such as Radio 7. Set the radio station screen to no picture (red button then '0'). Set the stand position with the radio station selected. Then switch P in P to the DVD. The CD will play but the stand will not turn back to the zero- default position because the controls think you are viewing the small (invisible) P in P radio screen.
If anyone knows a better way to keep the (older) Avant pointing the right way when playing a CD then please let us all know!
I used to be indecisive, now I'm not so sure. [W C Fields]