It sometimes might be worth checking different stem generation engines to see which one gives the best result.

I mostly doing my stem separation in SMP especially when trying to analyze and learn a bass line (see post above).

I am generally very happy with the stem quality produced with SMP but sometimes especially when trying to analyze some old recordings in compressed mp3 from YouTube I find that BIAB and SO7 give a better Bass stem.

The good thing is that it is very easy to line them up in SMP and audit them one by one to compare them as well as for the corresponding produced midi. In addition to generate stems one can also load up external stems into SMP and handle them as any of the other stems (to take advantage of the pure and clear GUI).

In this example I have loaded up 2 external stems of the same song produced by Studio One Pro 7 and BIAB and 2 internal stems produced by SMP, the 4 stem version and the 6 stem version all into SMP. So I have 4 differently generated BASS stems of the same song in SMP

The example is the song “You Better Move On – Arthur Alexander” on YT.

When comparing the different Bass lines it is easy to see that the SMP versions both have several gaps in the audio but the BIAB and SO7 have no gaps (continuous audio)

For this song it seems that BIAB and SO7 are very similar but when listening, I think BIAB comes out slightly on top for the bass stem for this particular song.

Edit:
These comments are only for the bass stem, did not check any other stems. My main focus was to be able to hear the notes in the bass line clearly.

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BIAB 2025, Studio One 7 Pro, Song Master Pro, Win11 Home. i7-9700K CPU, 32GB, ESI MAYA44eX, Guitar Pro 8, Transcribe, (EZKeys2, Superior Drummer3, EZBass, EZMix3)
Amateur: fiddle, guitar, vocal, beginner on bass.