Hi Kamilu.

Only PG Music can really answer this question. From memory, the +/– files were used in the earlier days of Realtracks. In 2013, Realtracks were only 5 years old, and audio and computing technology wasn't as advanced as it is today.

I suggest using Live Chat (the blue circular icon on the bottom right of the monitor) to talk directly with PG Music staff.

Regards,
--Noel


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Audiophile BIAB 2025