Thank you, rayc.

I downloaded Reaper and had installed JSFX Spectrum Matcher plugin, as you had guided. I never used that program/plugin before.
For a big newbie as I am, it's a little complicated to analyze this sort of stuff, at first view.
But I will try to understand its main concepts.

If you, please, could explain more details or show a little example, it'd be great.

Thanks.