Oh I´m glad i found this post! I really hate microstutter and has had this problem for years now (aparantly since 3.3 version). I´ve had minor crackles (audio crackle) here there but I can reliably reproduce the bug in Xtreme Racing CD32 version. If i run 040 with fast as possible and JIT it audio crackles up and the game almost freezes. But if i lower JIT cache size to 1Mb and lower cpu speed to maximum 190% it never crackles up. I admit I don´t know what I´m doing

but if it starts to crackle it seems i have to toggle some Advance JIT Setting to reset it, Hard flush or direct to indirect seems to flush the lag/crackle away. I tried the "3.3" version of WinUAE and I cant get it to trigger the crackle!