1- uBMSplay should play sound just fine, what version are you using? you can press 9 on your keyboard to show settings, then make sure KEY&BGM is selected in the autoplay area.
2- What do you mean by "keysounding an mp3 file", do you want to add sounds to the mp3 to play on top of the original song? or do you want to seperate the sounds in the mp3 file into different files?
If it's the first, then chances are you will ruin the song, if it's the second then it's nearly impossible to split whole songs into there components.
Unless you're a music composer yourself then the best you can do is try to edit an already finished keysound BMS. |