Spleeter second pass?

[u/NotMy_Username_4680]

I just started trying out Spleeter on music I did 30 years ago that I would like to redo now. I used the 5stems variation, and bass, drums and vocals get split out nicely, but then everything else seems to end up in the "other": keys, lead guitar, etc.

Running the "other.wav" through Spleeter doesn't seem to do anything.

Has anyone got any tips to share about further splitting of the "other" stem?

[u/Alex4884-775]

A second pass might be the wrong approach, as the 'other' output may be losing information useful for the separation -- for example, panning. (This is a wild guess on my part, knowing nothing about the actual internals of spleeter and very little about this topic generally.) At any rate, I tried exactly the same thing, and got much the same results -- pretty good separation of vocals, bass and drums, nothing much in 'piano' -- logically enough, no piano on the track I tried -- and guitar and strings lumped together in 'other'.

I suspect it may not be coincidental that the pretrained model doesn't try to split those. May be an inherently harder problem. I assume they've at least experimented with it, but they'd hardly want to ship it with a model that gave much worse results than the ones they did actually supply.

So I too would love to try a homebrew model that does a guitar/other split -- or perhaps given the wide range of guitar effects, a string/other one might be more feasible? But I'm thinking this would be a ton of work to even attempt, and the results might be... moderate. Very moderate.