i know it sounds very simple and shouldn't be ask but i really need help adding music. I thought there was a "add music" section or something to add music but i found nothing. After trying different things and trying to find answers, i now ask everyone on how they do it. the music files i use are .ogg because .mp3 takes more space and more space means bigger app file.
User manual - http://buildboxsoftware.s3.amazonaws.com/Buildbox-Docs-2.0.0.zip You can only use mp3s. You'll need to compress your mp3 file. I use dbpoweramp.