Hmmmm, I'm not really sure without listening to the audio of the offending item.

However, my first thoughts are perhaps using a parametric equaliser to like the PG music 5-Band Eq, or the Sonitus fx equaliser, or perhaps something like a Compressor/Gate.

I think some experimentation will be required.

Also, thinking outside the square, maybe you can consider increasing the dynamic range of the other instruments as an alternate option.


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