Library toneAC version 1.2 tested with Uno, Leonardo, Mega 2560, ATmega8 16MHz. Everything is okay.
Library toneAC version 1.2 with option TONEAC_TINY tested with ATmega8 16MHz. Also okay, 140 bytes smaller.
The TONEAC_TINY version has implications for the source code.
If I would use toneAC(1000,5); and switch to TONEAC_TINY, I must change that line. That is not obvious, since it is the same function "toneAC".
The second parameter changes from volume to duration.
Adding a second parameter (an unused volume byte) changes the size saving from 140 to 106.
I don't know what to think of it.
What about a ToneAC page in the Playground section ?