blastar (./41):

And why eyecatcher melody in my game fading out so sharply at the end?

opposite to the logo this sound is not coming from the bios and is played by the game itself. most games do this via FM, the NGFX-driver uses a short ADPCM-sample for this, which may not be perfect or optimal but is very small and saves space in the V-ROM.

I understood. By the way, already at the times, when I just had to begin to learn the Neo-Geo games, I noticed that some games (for example, Magicial Lord, World Heroes, Metal Slug 1) uses an alternate sound for eyecatcher melody. Since that I use to wonder - is YM2610 FM module able to generate a sounds, similar to sound of synthesizers used in Latvian cartoon "Phantadrome", or in Final Countdown performed by Europe, or in main theme of OST of Delta Force One starring Chuck Norris?