This mod appears to split the DMA from YM. This might be fine for musso's but for my current intro I'm using a YM-DMA SNDH and I can only hear one bit at a time ie the YM OR the DMA. For YM I get the sound from the microphone socket and for DMA its via phono.
So... is there an easy way ie lead so get the 3 inputs and combine to two phono input... secondly what the hell is this mod for!! :)