Q: mcos sierra issue

Hi,

I have a problem since i upgraded my iMac to the new os version, mcos sierra. my external audio device doesn't work anymore. my device is an Edirol UA 101 10 in/10 out. Roland, the constructor, doesn't provide a driver yet for sierra. So i need a solution to fix this because i have to use my device. Is it possible, without Time machine backup, to roll back to the previous version, ei capitan? thanks in advance for your help.

regards,

kaljagui