User blog comment:Dchan250/Winmugen V.S Mugen 1.0/@comment-30362814-20130506035215/@comment-3495717-20130506142428

MUGEN 1.0 uses a different sample rate (44100) to Winmugen. I'm not entirely sure what sample rate Winmugen uses, but I believe setting MUGEN 1.0's sr to that will "fix" the sound problems.