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Reaper is excellent for the money. Just to make sure it's clear, when some of us referred to a sequencer software, we were referring to a DAW. Examples include RealBand, SONAR, Reaper, Logic, ProTools, etc. There is one major advantage of RealBand (besides it being free with BIAB) that is the reason I recommend you start with that first, and the reason is that it reads the BIAB files directly. With any other DAW, you will need to export tracks or do what BIAB calls Drag 'n Drop to get tracks into the DAW, and you will lose the chord symbols. The BIAB song format is proprietary, but since PG Music also makes RealBand, it alone can read this format. There are a few other minor subtleties about this, but for now, until Music XML is fully supported, RealBand is your best bet starting out.

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.