MS 4.0 is Tao's mixed ym2149/dma-editor. it offers 3 psg-, as well as 3 dma-generated channels. it supports standard techniques (sidvoice, etc.) for the ym-channels and combined precalculated/realtime effects (ring-modulation, hard-sid, wave-shaping, overmodulation) to generate dma-sound. due to some technical problems, lack of time and motivation (?!) it hasn't been finished yet.