modified alsa-base of persitent system ... will this kill the live part of it?

['2+]

made a persistent boot usb-flash from the live-cd's menu (8,10)
my main machine (the only one that can boot from usb) is dell's mini9
by default the system auto-detected intel's HDA
but like the normal install .. sound will not be there
unless i add an option to /etc/modprobe.d/alsa-base
even after the reboot ... this fix still have an effect
so am happy with this machine but .. got afraid that

"maybe this usb-flash won't auto-detect the soundcard of other machines?"

am still confused with persistent at live's behavior
once i madify a conf related file
that aspect of live will get dead?

if i want to turn that part live again .. i should simply delete that
file before reboot?
am not brave enough to test that...
but
if the persistent live gradually turn "for this machine only"
then i'd simply just do a normal install
wanna be a stranger who comes to any office only with his kbd and usb-flash
wasn't this what persistent at live was for?

-- 
'2+ = podcasting:
http://sarigama.namaste.jp/podcast/rss.xml