Renoise Rewire Question

Hi. Is there any way in to get Renoise tempo changes to take effect when running as a Rewire slave? I usually start Cubase and then start Renoise which works fantastic. Only problem is that Renoise being the slave takes on the tempo that Cubase is set to.

Is it possible to run Renoise as a Rewire master? (ie. so that Renoise dictates tempo?) I don’t really think I’d want to do that to be honest anyway but its the only way I can think of doing it.

And (non Renoise question, sorry) - does anybody know if Cubase SX3 can support two audio cards simultaneously? I’d like to use one audio card for guitar input and another to mixed/master output.