Good luck finding anything, I've been looking for quite a while and havent even found the NAME of a bms editor, regardless of if it supports keysounds or not...
Get a multitrack of a song, split it into at least 600 keysounds (for a 2 minute song) and arrange it by the sequence of the song. Once it sounds good, you are now ready to arrange the chart to the desired sequence.
Get a multitrack of a song, split it into at least 600 keysounds (for a 2 minute song) and arrange it by the sequence of the song. Once it sounds good, you are now ready to arrange the chart to the desired sequence.
That's just a VERY short summary.
I think it's quite enough.
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English is not my native language, so mistakes may happen, excuse me for that.