I may be completely wrong about this (won't be the first time), but I think the X4 chord type might have been introduced after the first RealTracks were made. When BIAB adds a new chord type, an instrument may just be silent if it encounters that new chord for an older RealTrack that did not have that chord type when they were programming it. The chord type will always work correctly on MIDI tracks, but keep this in mind if you hear gaps in a RealTrack instrument. New chord types added for version 2013 include Xadd2 and Xmadd2.


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.