If you only want the bass: After you have split the stems, Go to Pitches, Select Bass Midi, then Go to Midi parameters-Options and select Bass Midi. Then use the Drag MIDI to take the bass track to a file or just drop it into Muscore.

As this post indicated (if not here I read it somewhere), there remains some "issues" with Bass in SMP which the developer is working on. You can use the Pitch view along with the midi parameters and you will notice there is often missing bass notes in the midi. But with a bit of effort the midi file can be fixed. In my current project the bass groove midi is captured well in sections of the song.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).