After a little reading, it seems that normalize, gnormalize (and others) are file conversion / enhancement tools for creating CD compilations and such.
That which I seek is a realtime program or plug-in to normalize output levels from the various streams and youtube clips as I play them.
Alternatively, does anyone know of a reasonably priced (Linux compatible) audio card with good AGC- automatic gain control- capability?
Thanks yet again,
A. G.