Otherwise, I do ALL THE RECORDING in Cubase, vocals etc, since
it's a superior mixing program and you can load vst's to massage
your sound, and in addition, you can't record JACK in Reason
anyway. I usually just the synths play through, but if I want
to record a bar of synth, say, a bass line, I can do that, record
the synth being played by a midi part in cubase acting on that
synth in Reason, record just the AUDIO of that channel, for a bar
i.e. "resampling" then re-import it back into my project as just
audio, and then mix. This you do if you are running out of cpu
power, which surprisingly, reason rewired into cubase does
NOT take up alot of cpu at all for half a dozen instruments.