Just wanted to add a few things to this discussion....I hope I am not acting out of line being a developer, but I would like people to be more informed. There is no software based transcription that is 100% accurate, that includes mine. 90% accuracy seems to be the accepted rate. This is pitch detection accuracy, getting the right note.. But why is bass so hard to get right?
By nature, bass notes are hard to detect. A low E is 41Hz it only vibrates ~41 times a second — a vocal or guitar note might be 200-800Hz — so the software has way fewer clean wave cycles to grab a pitch from, especially on fast lines. There's also a well-known octave problem: a lot of bass tone has a fundamental quieter than its own overtones, so the software locks onto the wrong octave and reports a note that's confidently wrong, not just slightly off. On top of that, bass sits buried under kick drum and low guitar even after isolation, and long sustained notes actually get less clear mid-decay, not just at the attack. Ghost notes, fast repeated plucks, and slides are their own separate headache. Bass sits in the exact frequency range and mix position where every assumption pitch-detection makes gets stress-tested — guitar and vocals have it easy by comparison.
Fingering is its own mess, and it's not really fixable either. Most notes can be played in 2-3 spots on the neck with no single "correct" answer — it depends on speed, what's around it, and personal style. Ask ten bassists to play the same line and you'll get several different, all-correct fingerings back. Software has to pick one and show it to you. Worse, a pattern that's ergonomic for a slow groove is often wrong for a fast passage (using an open string as a quick accent, for example) — so there's no one profile that pleases everyone, because there's no one way real people actually play. I am currently working on these problems, especially the fingering. But even with my 45+ years of experience playing bass I have yet to create a fingering profile that gets it all right. Ive thought about asking all experience levels of players to describe how they come to play the songs they know a certain way, pattern or position and what factors influence these decisions.. its a hard one and again I dont know if I would be stepping out line asking that question here.
GP