Hi Markus,
thanks for sharing the .wav file.
Your piece is interesting, i really enjoyed it.
I have managed to identify some high ringing frequencies at 2.5, 3.2 and 3.9KHz. The resonance menu presets from Vienna Suite really helped. Unfortunately, i can't label what's going on within your mids....i am afraid this must be done one instrument at a time.
Some problematic low frequencies in the first crescendo might depend on the Double Basses.
You might also wish to tame some IR's resonances.
Here is my advice: have one instance of the Vienna Suite Equalizer on each instrument track, pick up the resonance menu preset (from Dietz himself) and turn on the built in analyzer...... you will label the annoying frequencies and decide how much you need to cut. Each piece is different (the key etc...), getting rid of all the resonances is too much.
Once your instruments are 0.K. and you are happy with your general reverb settings, you can add an Eq after the reverb (here is what i do, others might do it differently) and tame the room resonances. You will do the same Eq on the other stems, more or less.
Last but not least, a couple of speakers might ease your work in many ways. Even if they bottom at 55Hz (hence forcing you to a blind high pass) and even if your listening environment is sub-optimal they will help you identifying the problematic frequencies faster. Just letting you know: thanks to Dietz i started having more reference tracks, and this led me to know my speakers better, to an extent this might work with headphones too.....not sure though.
I hope it helps. π
Best Regards
Francesco
P.s. Bacos work is perfect, as always.