It sounds to me like there's some white noise in there too. Like the noise floor is kinda high, or perhaps a bit of smooth distortion. Then, towards the end, I realized that it could have been the tremolo strings being low in the mix.

The mix sounded good to me on my speakers with the exception of the strings being a bit too loud in the middle section. I would have liked to hear the voice a bit crisper too. It sounded a bit too far back in the mix.

Regarding panning, I didn't listen on speaker that are wide apart or cans so I can't point out issues other than to say with jazz, I like to keep most things centered or no further than 20% panned but always have something else on the other side the same distance to balance the mix and give it a feeling of sonic space.

Not a "bad" mix, but a few tweeks would make it better.

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