try using: rate=44100 blocksize=1024 prebuffer=20 all other rates 44100 too also tell us what is your cpu usage when cracking happens And what do you mean by this: "All worked bar the Pro Audios but all the rest still had the hiss/crackle effect." ?? what is your dosbox version and where have you …

Been trying to get my Star Trek 25th CD to work the past few days with some perfect results except for some audio problems. Game runs smoothly same goes for the music (using Roland LAPC-1 / MT-32 from options) but the sound effects have a hiss and crackle effect of all effects (background, voices, …