I have Windows ME, and I'm not totally satisfied with it, but it seems to be a little more stable than 98SE. The backup thing is a mixed blessing. It is good to be able to restore to a previous time when something gets messed up. If you are unlucky enough to get a virus though, it is quite a pain to remove it from the Restore File. ME won't let you access it, because it is "in use". So you either have to disable it, or go to DOS and manually remove the virus. The Restore features makes a copy of everything, including the virus.
To be perfectly honest, I don't do a whole lot of recording or sequencing on my computer, but I don't see any problem with what I have done. But that doesn't mean the Pentium wouldn't do it better.
DonM