Testing on physical hardware, booting the Fedora-SoaS-Live-x86_64-32-1.6.iso directly using this grub menuentry:
menuentry 'SoaS 32 Live' --class fedora --class gnu-linux --class gnu --class os {
insmod part_gpt
insmod ext2
set root='hd1,gpt2'
set isolabel=Fedora-SoaS-Live-32-1-6
set isofile=/Fedora/Fedora-SoaS-Live-x86_64-32-1.6.iso
loopback loop ($root)/$isofile
linux (loop)/isolinux/vmlinuz boot=isolinux iso-scan/filename=$isofile root=live:LABEL=$isolabel ro rd.live.image rd.live.ram
initrd (loop)/isolinux/initrd.img
}
The Speak Activity and Clock Activity are silent.