It appears that Band-in-a-Box music composition tool allows export to .mp3 files, so this type of sgu to mp3 conversion is doable with the program. It seems that no other program can reliably convert Band-In-a-Box files (.sgu), so the original tool remains your only chocie.
Convert Band-in-a-Box midi song to Compressed audio and music file, mp3 songs or ringtones.
We have found 2 software records in our database eligible for .sgu to .mp3 file format conversion.
Microsoft Windows software - convert sgu to mp3 on Windows
MuseScore is a free cross-platform WYSIWYG music notation program that offers a cost-effective alternative to commercial programs such as Sibelius and Finale.
Convert from sgu file
to mp3 file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sgu to mp3. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert sgu to mp3 on any platform
Band-in-a-Box is a music composition tool and multitrack editor. Final Band-in-a-Box composition can be burned on Audio CD or exported to popular audio formats such as WMA, MP3 etc. Band-in-a-Box is available for Microsoft Windows and Mac OS X.