So. I decided not to wait for the weekend. I poured myself a beer and today I conducted another experiment with software version 1.04. Well... History repeated itself with noise in CD mode. I even recorded these sounds on my phone. Unfortunately, this audio file cannot be posted on this forum, but the noise in the recording is clearly audible. I recorded at a distance of 1...2 centimeters from the tweeter of the speaker system. The volume level on the Yamaha A-S1200 amplifier was set to approximately 2/3 of maximum. In general, I returned the software version 1.03 again.