The stretching process you refer to is involved when:

(a) BIAB creates a required chord pattern by transposing an existing audio pattern (for example, the recording Realtrack musician may not have played C#9 in his/her Realtrack creation but if C9 was played, this could easily be transposed up a semitone to C#9);

(b) BIAB uses Realtracks or Realdrums at tempos other than those at which the instruments were recorded.

By setting that option to 'High', and since the Audiophile version of the software uses WAV, you are setting the stage for the best audio production possible.

To get the best quality rendering of a final output audio, render to WAV. As far as I'm aware, there is nothing else that needs to be done. The reason that WAV is the best final render format is because it is lossless audio. By comparison, mp4, mp4, wma, are all lossy formats and, as such, reduced audio quality.

Hope this helps,
Noel



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Audiophile BIAB 2025