Hi everyone, I have been running El Capitan for about 2 weeks now, but I only discovered today that the audio interface I use to record music (an M-Audio Fast Track Ultra) is not supported on El Capitan. Basically, it is not recognized at all by my computer (doesn't show up in the sound system preferences) even after reinstalling the latest drivers. Knowing that M-Audio has stopped making this product, it could take a really long time for them to make a new driver, if they do make a new one... So I'd like to downgrade from El Capitan in order to solve that problem. Now, I don't have a time machine backup, but I have an old backup I made on an external hard drive with SuperDuper in September 2015. At this time I was running Mavericks. I have read several articles about downgrading from El Capitan without Time Machine and they all mention making a bootable version of the previous system on an USB drive and using that to downgrade. I probably could do that but I was wondering if I could use a simpler solution: how about I start my computer from my September 2015 backup disk, move all the files I created and made changes to since then from my computer's drive (which is running El Capitan), make sure everything works, and then copy the now-complete Mavericks backup onto my computer's hard drive? Not sure is that's clear, I hope you get the idea... Do you think that would work and if so, can you recommend a way of moving the data that was created/changed between Sept 2015 and now onto my backup drive?