I have a song I made up using 32 bars of 4 choruses which plays normally. Simple enough.
I also normally use "Audio, Export Song As An Audio File" and have it create a separate file for each track.
Funny thing is that the rendering produces a good MP3 file for the Piano, Drums, Guitar and Strings but I get the following error messages when it is rendering Bass and Melody. Those are rendered as WAV files and are not compressed to MP3 files like the others.
I am using the standard CoyoteWT synth for midi.
Rendering succeeded! [2021.813.0, 12/29/2020 4:30:43 PM] Audio Conversion Error: MP3 conversion failed. It is possible that you do not have any ACM codecs installed. [2021.813.0, 12/29/2020 4:30:43 PM] Audio Conversion Error: Media Foundation failed to convert to .mp3. Trying alternate conversion method... The error number is -1072875847 [2021.813.0, 12/29/2020 4:30:43 PM] Audio Conversion Error: MP3 conversion failed. It is possible that you do not have any ACM codecs installed. [2021.813.0, 12/29/2020 4:30:23 PM] Audio Conversion Error: Media Foundation failed to convert to .mp3. Trying alternate conversion method... The error number is -1072875847 [2021.813.0, 12/29/2020 4:30:23 PM]
What exactly is the ACM codec that BIAB seems to think I may need?
LAME?
or some other.
Using build 813.
BIAB2026 Windows 10 Pro (Never Windows 11!) WA6NCB
Just tried 2 different songs and the 1st song results were the same. 4 MP3 files and 2 WAV files with the error message.
The 2nd song only had the Bass, Piano, Drums, Guitar and Strings tracks populated but this song would not render the Piano track to a MP3 file, all I got was a WAV file.
BIAB2026 Windows 10 Pro (Never Windows 11!) WA6NCB
I tried it using various bit rates and it seemed to work OK at anything under 192000.
192000 and above seems to fail every time on the Bass Track. Bass track is usually a Mono Track also.
You were using 128000 and it worked OK for you. Try a bit rate of 320000 and see what happens.
Now when I dragged the MASTER to MP3 using Drag-Drop method, it works OK.
When using Drag Drop it is interesting that BIAB does not give me a bit depth, sample rate or bit rate choice as I get using "Audio, Export Song As An Audio File".
I will do a full rebuild on the style list and see what happens.
BIAB2026 Windows 10 Pro (Never Windows 11!) WA6NCB
Funny thing is that the rendering produces a good MP3 file for the Piano, Drums, Guitar and Strings but I get the following error messages when it is rendering Bass and Melody. Those are rendered as WAV files and are not compressed to MP3 files like the others. ... ... What exactly is the ACM codec that BIAB seems to think I may need?
The ACM conversion method is a fallback in case Windows Media Foundation conversion doesn't work for some reason. For MP3's, Windows Media Foundation works on Windows 8 and higher. So that's not the issue here. It seems to be specifically having to do with creating higher bitrate (320Kbps) MONO file. Perhaps Media foundation doesn't support that... I'm not sure. One fix is to set the 'Channels' to stereo instead of auto.
(ACM is an older method that was used prior to media foundation and was tricky to get working for mp3's so it's not surprising that's failing as well).
Band-in-a-Box® 2026 Mac Special Offers Extended Until May 31st!
Good news- we've extended our Band-in-a-Box® 2026 for Mac® special offers until May 31, 2026!
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With Band-in-a-Box® 2026, we've released 202 incredible new RealTracks (in sets 468-488) in a variety of genres—featuring your most requested styles!
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Country, & Americana (Sets 483–488):
Our new country & Americana RealTracks deliver a rich collection of acoustic, electric, and roots-inspired styles! We have new country pop (9) with legendary guitarist Brent Mason. There is also a potpourri (14) of bouzouki, guitars, banjo, and more, perfect for adding texture and character to contemporary acoustic arrangements. We’ve added funky country guitar (5) with PG favorite Brent Mason, along with classic pedal steel styles (5) featuring steel great Doug Jernigan. There are more country songwriter styles (8) that provide intimate, rootsy foundations for storytelling and modern Americana writing. Finally, we have “background soloing” acoustic guitar (12) with Brent Mason — simpler, but still very tasty acoustic lines designed to sit beautifully behind vocals or act as a subtle standalone solo part.
And, if you are looking for more, the 2026 49-PAK (for $49) includes an impressive collection of 20 bonus RealTracks, featuring exciting and inspiring additions to add to your RealTracks library. You'll get new country-rhythm guitar styles from PG Music favorites Johnny Hiland and Brent Mason, along with modern-pop grooves that capture today’s radio-ready sound! There are also new indie-folk styles with guitar, bass, 6-string bass used as a high-chording instrument, acoustic guitar, and banjo. Plus, dedicated "cymbal fills" RealDrums provide an added layer that work very well with low-key folky styles with other percussion.
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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
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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!
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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.
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