It’s not the MP3; that’s audio and could not be failing to play some notes. The problem is whatever is producing the notes that are recorded into an MP3. Your Roland is one of the few Roland MIDI synths I’ve never used, but they all have a spec for polyphony ( the number of notes that can sound simultaneously). After you add harmony and strings, certain patches can overload the module. Are you hearing all the notes in BIAB when you play the song?


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.