The only band to wave conversion we know about, is potential export of GarageBand music projects (.band) as standard PCM audio file (.wav or .wave). Not many music composition tools actually support GarageBand files, mostly apps for Mac. Thus your best option is to do this with Apple Logic Pro or Apple Garageband, or use different output format (preferably lossless format) that you can later convert to .wav.
Updated: October 20, 2023