First cut the mp3 into several segments according to your needs. More powerful software such as CE can cut mp3 directly. If you can't cut directly, you can use foobar, lame and other software to convert it to wav format first and then use the Windows built-in recorder to cut -"- ??2. Regarding the production of bms, I will take V3 as an example. For example, cut the V3 mp3 into three sections (no need to explain which three sections, everyone who has played it should know). After finishing the 110 sounds in the first section, cut the 1, 3 at the beginning of the second section. Once the positions of the four keys 5 and 7 are correct, you can save it and leave it alone. Then create a new bms file and start from the first four notes of the second paragraph to the end of the second paragraph. Copy all the notes in the second paragraph, open the bms file of the first paragraph, find the last four notes, and align them with the four notes at the beginning of the second paragraph. Finally, browse them as a whole and take a look. Can the various segments be integrated well?