I've had an experiment with this and I think what you are trying to achieve, can't be done. In my opinion you are just making hard work for yourself by using the Nashville system or Roman numerals. It seems that BIAB does not take this into account with key changes. It also doesn't conform with the standard upper and lower case, unless I'm missing something. From what I can figure out, BIAB cannot modulate to different keys, the song itself is set to just one key.
Yes this is maybe a shortcoming but I don't personally see it as much of a problem. This is not composing software.
With that said, it's also not a problem unless this somehow alters they way it generates chords. Some say it does, I'm not so sure myself - either way, you need to understand one thing that's important...
"Key signature" and "Key" are not really the same thing. In this respect, I think BIAB is doing things correctly - it just isn't taking chord position into account as they all relate to the overall key that is set for the song.
If all you want to do is make the notation display correctly then just use chord names.
Example:
Key of C ... I, ii, iii, V = C Dm Em G Key of D ... I, ii, iii, V = D Em F#m A
BIAB displays this as I IIm IIIm V which I find odd but maybe there is a setting I have overlooked.
Either way. Let's look at those chords in Roman numerals all in the key of C major (with BIAB interpretation in brackets).
C = I (I) D = II (II) Dm = ii (IIm) Em = ii F#m = #iv G = V A = VI
Personally I would have a harder time deciphering that than if I just looked at chord names, it just seems messy.
So back to using chord names and looking at what BIAB is doing.
4 Bars in the key of C C Dm Em G
change key to D at bar 5 D Em F#m A
Now go to settings and change the key signature to D major at Bar 5 ... everything in the notation is correct and showing as it should. BIAB just doesn't take that into account if you switch the chord display type. Just remember, key signature is a notation thing only - it does not relate necessarily to the home key.
That might seem a bit odd but it's not really. Most of these things are about keeping notation as tidy as possible. If you have a whole bunch of chords throughout a song that do not conform strictly to one single key (quite common) then notating everything as a change of key would become a mess for any reader. Much better to improve your theory and knowledge of chord function if you want to think in numerals. As I said, I personally think you're just making hard work of it.
Just remember, key signature is a notation thing only - it does not relate necessarily to the home key.
This is quite important and I think Lee N may well have identified a confusion.
The key signature identifies the "home key" for the song and gives a short-form indication of how to identify the notes as they're written on the staff. For example, if the key signature is BbMaj, then the there will be three flats at the start of the staff and the reader will know that notes on the B, E and A positions are to be played as Bb, Eb and Ab. Many songs will modulate to a different key for a while, then return to the home key, and during those parts the reader will see that as notes on the staff start to get individual sharps, flats or naturals, which will remain for the duration of the bar or until another sharp, flat or natural.
It unusual to change the key signature for that. It's normal that those sharps, flats and naturals indicate the modulation -- the temporary key change.
As an example of this, it's perfectly possible to write any song with a CMaj key signature and mark all accidentals as they're used in the song. Some people prefer to work that way and there is no reason why they should not do so.
I don't tend to write chords using the Nashville/Roman notations, but just to see what BiaB does, I tried typing #IV and #V7 into cells and saw the F# and Ab7 that I would expect. For my own benefit I also tried iii7 and iiim7 to check how major and minor thirds are handled.
Jazz relative beginner, starting at a much older age than was helpful. AVL:MXE Linux; Windows 11 BIAB2026 Audiophile, a bunch of other software. Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts .
62. How do I change keys in the middle of my Band-in-a-Box® song? Can I display more than one key signature? To transpose to a new key in the middle of a song, you can use the Edit | TransposeFrom...to Dialog. To display the new key signature in the notation window, you can use the Settings for Current Bar dialog (press F5 at any bar).
Lee beat me to the punch as I can change keys in BiaB by typing in the chords, for example A-D-E to Bb-Eb-F is no problem. I don't now how this looks in notation as I do not use BiaB notation.
I arrived early to a restaurant. The manager asks, "do you mind waiting a bit?" I said no. "Good", he said. "Take these drinks to table 3"
64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware
Lee beat me to the punch as I can change keys in BiaB by typing in the chords, for example A-D-E to Bb-Eb-F is no problem. I don't now how this looks in notation as I do not use BiaB notation.
Thanks for the reply. After reading the official information, I found the answer. I don't know much about the rest.
I believe BIAB will get better and better. I'm looking forward to the BIAB2023 release right now. Ha ha
OK, now that the smoke has settled and I have calmed down, I think we are ready to move to the real reason that we want to include Key Changes in our music. If you have not see this video, and you want to learn more, please follow Adam here.
OK, now that the smoke has settled and I have calmed down, I think we are ready to move to the real reason that we want to include Key Changes in our music. If you have not see this video, and you want to learn more, please follow Adam here.
OK, now that the smoke has settled and I have calmed down, I think we are ready to move to the real reason that we want to include Key Changes in our music. If you have not see this video, and you want to learn more, please follow Adam here.
I love this lesson. It gives me goosebumps.
Thanks for posting that. A seminal example of the power of key change.
There's a difference, though, between an actual key change and whether that key change should be written into the key signature. I don't have strong feelings about that ... for me it's a tradeoff between recognising the key change from the accidentals or seeing the new signature and having to change my understanding of the accidentals.
I've been thinking throughout this thread of a particular example and the mention in the video of John Coltrane prompts me to mention it, and that's his "Giant Steps", which changes key something like every bar, to the extent that a written "key" becomes probably irrelevant. In practice one learns the chord progression and just "deals with it". The version I use is written in C Major and every chord/note/key is defined by the music as it's written.
Jazz relative beginner, starting at a much older age than was helpful. AVL:MXE Linux; Windows 11 BIAB2026 Audiophile, a bunch of other software. Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts .
I had to do this the other day. I wrote out Verse 1 in the desired key, then changed the entire song to the new key that I wanted for Verse 2. I selected the Verse 1 bars and pressed Ctrl+C to copy, then Ctrl+Z to Undo the transposition of Verse 1. I then pasted the chords below verse 1 which remained in the new key, and then pressed F5 on the first bar of verse to let BB know about the new key.
2026 Free Bonus PAK & 49-PAK for Band-in-a-Box® 2026 for Mac®!
With your version 2026 for Mac Pro, MegaPAK, UltraPAK, UltraPAK+, Audiophile Edition or PlusPAK purchase, we'll include a Bonus PAK full of great new Add-ons for FREE! Or upgrade to the 2026 49-PAK for only $49 to receive even more NEW Add-ons including 20 additional RealTracks!
These PAKs are loaded with additional add-ons to supercharge your Band-in-a-Box®!
This Free Bonus PAK includes:
The 2026 RealCombos Booster PAK:
-For Pro customers, this includes 27 new RealTracks and 23 new RealStyles.
-For MegaPAK customers, this includes 25 new RealTracks and 23 new RealStyles.
-For UltraPAK customers, this includes 12 new RealStyles.
MIDI Styles Set 92: Look Ma! More MIDI 15: Latin Jazz
MIDI SuperTracks Set 46: Piano & Organ
Instrumental Studies Set 24: Groovin' Blues Soloing
Artist Performance Set 19: Songs with Vocals 9
Playable RealTracks Set 5
RealDrums Stems Set 9: Cool Brushes
SynthMaster Sounds Set 1 (with audio demos)
iOS Android Band-in-a-Box® App
Looking for more great add-ons, then upgrade to the 2026 49-PAK for just $49 and you'll get:
20 Bonus Unreleased RealTracks and RealDrums with 20 RealStyle.
FLAC Files (lossless audio files) for the 20 Bonus Unreleased RealTracks and RealDrums
MIDI Styles Set 93: Look Ma! More MIDI 16: SynthMaster
MIDI SuperTracks Set 47: More SynthMaster
Instrumental Studies 25 - Soul Jazz Guitar Soloing
Artist Performance Set 20: Songs with Vocals 10
RealDrums Stems Set 10: Groovin' Sticks
SynthMaster Sounds & Styles Set 2 (sounds & styles with audio demos)
XPro & Xtra Styles PAK Sets On Sale Now - Until May 15, 2026!
All of our XPro Styles PAKs and Xtra Styles PAKs are on sale until May 15th, 2026!
It's the perfect time to expand your Band-in-a-Box® style library with XPro and Xtra Styles PAKs. These additional styles for Band-in-a-Box® offer a wide range of genres designed to fit seamlessly into your projects. Each style is professionally arranged and mixed, helping enhance your songs while saving you time.
What are XPro Styles and Xtra Styles PAKs?
XPro Styles PAKs are styles that work with any version (Pro, MegaPAK, UltraPAK, UltraPAK+, or Audiophile Edition) of Band-in-a-Box® 2025 (or higher). XPro Styles PAKS 1-10 includes 1,000 styles!
Xtra Styles PAKs are styles that work with the UltraPAK, UltraPAK+, or Audiophile Edition of Band-in-a-Box® 2025 (or higher). Xtra Styles PAKs 1-21 includes 3,700 styles (and 35 MIDI styles)!
The XPro & Xtra Styles PAKs are not included in any Band-in-a-Box® package.
The XPro Styles PAKs 1-10 are available for only $29 ea (reg. $49 ea), or get them all in the XPro Styles PAK Bundle for only $149 (reg. $299)! Listen to demos and order now! For Mac or for Windows.
The Xtra Styles PAKs 1-21 are available for only $29 ea (reg. $49 ea), or get them all in the Xtra Styles PAK Bundle for only $199 (reg. $349)! Listen to demos and order now! For Mac or for Windows.
Note: XPro Styles PAKs require Band-in-a-Box® 2025 or higher and are compatible with ANY package, including the Pro, MegaPAK, UltraPAK, UltraPAK+, and Audiophile Edition.
The Xtra Styles require the UltraPAK, UltraPAK+, or Audiophile Edition of Band-in-a-Box®. (Xtra Styles PAK 19 requires the 2025 or higher UltraPAK, UltraPAK+, or Audiophile Edition. They will not work with the Pro or MegaPAK version as they require the RealTracks included in the UltraPAK, UltraPAK+, or Audiophile Edition.
Supercharge your Band-in-a-Box today with XPro Styles PAKs and Xtra Styles PAK Sets!
With the release of Band-in-a-Box® 2026 for Mac, we’re rolling out a collection of brand-new videos on our YouTube channel. We’ll keep this forum post updated so you can easily find all the latest videos in one convenient spot.
Whether you're exploring new features, checking out the latest RealTracks or Style PAKs, this is your go-to guide for Band-in-a-Box® 2026.
Band-in-a-Box® 2026 for Mac is here and it is packed with major new features! There’s a new modern look, a GUI redesign to all areas of the program including toolbars, windows, workflow and more. There’s a Multi-view layout for organizing multiple windows. A standout addition is the powerful AI-Notes feature, which uses AI neural-net technology to transcribe polyphonic audio into MIDI—entire mixes or individual instruments—making it easy to study, view, and play parts from any song. And that’s just the beginning—there are over 100 new features in this exciting release.
Along with version 2026, we've released an incredible lineup of new content! There's 202 new RealTracks, brand-new RealStyles, MIDI SuperTracks, Instrumental Studies, “Songs with Vocals” Artist Performance Sets, Playable RealTracks Set 5, two new RealDrums Stems sets, XPro Styles PAK 10, Xtra Styles PAK 21, and much more!
Special Offers
Upgrade to Band-in-a-Box® 2026 for Mac and save up to 50% on most upgrade packages during our special offer—available until May 15, 2026. Visit our Band-in-a-Box® packages page to explore all available upgrade options.
2026 Free Bonus PAK & 49-PAK Add-ons
Our Free Bonus PAK and 49-PAK are loaded with amazing add-ons! The Free Bonus PAK is included with most Band-in-a-Box® 2026 for Mac packages, but you can unlock even more—including 20 unreleased RealTracks—by upgrading to the 2026 49-PAK for just $49.
Band-in-a-Box® 2025 for Mac® users: Build 904 now available!
If you're already using Band-in-a-Box® 2025 for Mac®, make sure to grab the latest update! Build 904 is now available for download and includes the newest additions and enhancements from our team.
One of our representatives will be happy to help you over the phone. Our hours of operation are from
6:00AM to 6:00PM PST (GMT -8) Monday thru Friday, and 8:00AM to 4:00PM PST Saturday. We are closed Sunday. You can also send us your questions via email.
One of our representatives will be happy to help you on our Live Chat or by email. Our hours of operation are from
6:00AM to 6:00PM PST (GMT -8) Monday thru Friday; 8:00AM to 4:00PM PST (GMT -8) Saturday; Closed Sunday.
Dansk
Deutsch - Windows
Español
Français - Windows
Italiano - Windows
Nederlands
Polski
Português
Svenskt
русский
Japanese
Simplified Chinese
Traditional Chinese
Korean