Split type.1.If the purpose is "song," you need to upload a music file containing both vocals and instrumental (the vocals must be in a singing format; ordinary speech is not supported). The output will include voice_id and instrumental_id. 2.If the purpose is "voice," you need to upload a file containing only vocals in singing format (ordinary speech audio is currently not supported). The output will include voice_id. 3.If the purpose is "instrumental," you need to upload a file containing only the instrumental. The output will include instrumental_id.