How to question? Multiple audio devices

How to question? Multiple audio devices 

Hi, I have a usb2 M-audio Fast Track Ultra and an Alesis firewire Multimix 8. I just sold an old PowerBook (Mac) that was running Reaper and having both these devices hooked up worked fine. I have transferred over to a desktop running Windows XP and I can't get both of the devices working at the same time. In Reaper, in preferences, in devices, they both show up and I can use either the M-audio or the Alesis just fine for recording. In the Mac it might have been so easy since they were combined in the Mac system as an aggregate device so in Reaper the two together looked like one device with 14 channels. Is there a similar way to aggregate these two devices in Windows XP? Or in Reaper? Cheers

use the search engine, this topic has been covered extensively. bottom line : easy on Mac - not easy on PC (or even impossible / but I am no PC-guy).

Thank you for the ASIO4ALL tip. I'm new to this stuff, but I had already tried that and it didn't work (I didn't know it was supposed to work or else I would have mentioned I tried it). The Maudio device shows up, but the Alesis does not. The only two that show up are the Realtex AC97 and the Maudio. I'll do some looking around on the ASIO4ALL website for info on the Alesis.