Fusion is closed source, so who can say? But other emulators with source you can look at. For Gens/GS R7, when the 32X part is activated, it builds an address map that never includes the CD, so it not only doesn't do mode 1 in 32X mode, but doesn't allow CD32X games either. Most emulators are more concerned about running existing software than actually emulating a platform EXACTLY, and there was never any 32X mode 1 software until I added it to Wolf32X. A good example is Fusion: the PWM audio in Fusion was originally done to work with existing games, which used a particular way of setting the PWM using sample code from Sega. It sounded weird with my early PWM demos because of that. Snake changed Fusion to handle that using my demos for testing for his final version. So I'd expect that if he came out with an update, it would probably do all these new things... so here's hoping he has a new rev coming out!