A floating ground won't work with a power amp. It may not work well with low-power, signal-level (preamp) circuitry either.
I was about to say there's lots on power supplies in this forum, but no, I was thinking of that OTHER forum that has (among other things) a lively chip-amp subforum. There's still, of course, good power supply discussion in THIS forum.
Also, I was amused at the phrase "copy of gainclone" (look up the history of the word gainclone, or even the word clone), also that this post was the first in this thread in 9 years. Now I can't remember the word for this, necro-something ... necro-posting?