Your vocal track should still be there. Look in the same folder as the BIAB song with the identical name but with extension .wav. Hint: it will be a very large file.

To make the mp3 you need the lame mp3 codec. It is available for download in many places just google it. Or look for the K-Lite Codec Pack which has been reported to work nicely with BIAB.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6