Sven,
If its a master then compression on everything but the stereo bus is recommended. Mastering won't be able to control single elements of a mix as well as they could be in the mixdown itself, so its best they are taken care of then.
That being said I do sometimes have people resend masters with some of the compression they were using on groups or single tracks reduced if it's detrimental to the final result.
With multiband compression certain frequency areas of the mix can be controlled although with tradeoffs. I routinely get mastering jobs where the bass is too dynamic so the trick is to level this without huting the kick too much.
For a mixdown you can leave all compression off unless it's a particular effect that you want exactly as you have set. In some cases I will have the plugin that you use so I could merely disable it o change the settings if need be.
Another option is (if you use a plugin I don't have installed) is to bounce dry and effected versions of tracks you are not sure about.
This gives me not only the oppertunity to use your settings but also have a reference to what you were aiming for in order to help guide my own adjustments.
As far as live instrument tracks the same rules above apply to them.
Hope this helps,
Jesse
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