Both Boosting and Compression Needed - Across a WIDE ...

Hi,
I am "preparing" instrument audio for use in a synthesizer. My goal is present an even, solid level of audio (at a good DB) to the synth.

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PROBLEM: Sometimes the audio signal is too soft (low DB), and at times it's too loud (higher DB) - and over a very broad range of frequencies - like 200Hz to 20KHz. I DO NOT KNOW - ahead of time which frequencies will be louder or softer, and when. Perhaps in song one at some point in time it's 400Hz that is too soft and needs boosting, then in the same song 20 seconds later that exact same frequency is too loud and it needs compressed. Yes, I know - I'm a terrible musician.
this is to be used in live performance - not recorded music; just to be clear

SOLUTION ATTEMPT: Since there is a broad frequency range that I want to both BOOST (only if the volume level is too low); or COMPRESS (only if /when the volume level is too strong or loud) - I thought I could use FabFilter Q3 with it's "dynamic" feature. Here's the pic:

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OK. On the FabFilter forum their 'expert' suggested to use their Multiband Compressor. This doesn't seem to make sense to me; since -as I explained- up front I have no idea which frequencies need boosted or compressed, at which moment in time.

Are there better plugins to EVEN and 'strengthen' the DB level??

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