I tend to brutally highpass pianos in full mixes. That said, I went back and automated the EQ to ease up during the quieter sections. I like this better. Even so the low end is chopped off the piano, which is nothing but murky haze and doesn't contribute anything meaningful.
Bass was my typical signal chain, compressor, multiband comp, distortion, EQ.
Acoustic guitars sounded good, just some low cuts and light compression.
The lead acoustic guitar instrument had very big transients so I used some peak compression to bring those into line.
Vocals were the one problem. Recording has a midrange sound, kind of unnatural. That means damage control EQ, rather than minimal EQ on a good recording.
Drum kit was processed minimally, bit of low end off the kick and a boost in the mid. Cutting the fundamental of the snare to make it sound lighter. Parallel compression on the whole kit.
The sax sounds nice... is it real? Sounds pretty real to me.
Anyway, if you have more questions I'm happy to answer them.