Modern TotalMix definitively can be controlled by OSC. That is "software" feature, OSC is processed by TotalMix app itself, the hardware is not involved. While designed for TouchOSC, that can work with any OSC App as long as settings are correct (IP addresses, ports and layout).
To check that it works, you can run OSC application on the same PC under Windows. F.e. my own:
http://www.azslow.com/index.php/topic,352.0.html
Note that this program is specially written for blind users, it make no big sense for other but should work for testing.
Once you get that running locally, you can continue with touchOSC on tablet. At least you will know that PC side / totalmix is configured correctly (but do not forget to enable TotalMix in the firewall).