Quite capable instrument, free, for Audio type work.
https://www.roomeqwizard.com/
Be sure to protect sound card inputs and outputs, google "protect sound card inputs", many approaches and
circuits on web.
Regards, Dana.
I know that there is a wealth of useful information on this forum about the various ECADs: Altium Designer. Eagle, Proteous, ORCAD... but with the change of ownership of EAGLE, which is the most widely used ECAD for home use, I am reevaluating the various free packages.
One package of interest...