Maybe, maybe not.

RealBand can create backup files - but only if the setting is enabled.

From the Help:
"Backup Settings

When the Create backup file when overwriting SEQ files settings is enabled, RealBand will always create a backup file (BKS file) when a .SEQ file is overwritten. For songs saved into the same hard drive that RealBand is installed, the backups are placed into RBBACKUP subfolder of the RealBand folder. For songs that are saved to a different hard drive, the backups are placed in a RBBACKUP folder which is off of the root (e.g. D:\RBBACKUP)."

It may not have saved the Audio Track but may have saved the RealBand file, which could be recovered - if any save had been performed.

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