Hello tukinem, thanks for your reply. I tested again, and found the reason why it doesn't work.
My A500 has two accelarator cards. On ACA1234 with 68030@50MHz, the music is sometimes playing and sometimes not in the lift and in the levels.
With ACA500plus with an 68000@28Mhz, the music is played on all screens.
The adf version copied to hdd works fine with both cpu's.