pwalpwal
noel's answer is the most informative, actually going some way to explaining why sonar doesn't do this, rather than offering workarounds and questioning why a user might want to do it
thanks noel :)
Agreed about Noel's answer, but IMHO the other elements further the discussion. It's not necessarily obvious why this capability is needed, and it took several posts to establish that it's important only if a) the synth has parameters that aren't recordable as MIDI data, b) these parameters involve randomization, c) the person is playing a part and evaluating it simultaneously, and d) it is not acceptable to try different randomizations of parameters and then decide if you like one version more than another. That's a fairly specific set of circumstances, and it's understandable why people couldn't relate if it's not a part of their workflow.
As to workarounds, I think one of the best functions of a forum is to provide solutions. Using two patch cords and the external insert plug-in provides a solution that addresses a-d above.
Of course, it's not as elegant as being able to hit a record button for the instrument track; that's obvious. But it's not necessarily elegant to switch to another program solely to meet the a-d conditions above. With a recent thread asking whether people have forgotten about the external insert option, it seemed worth underscoring.
I don't think using two patch cords is complicated, but I play guitar

. Figuring out how to run the AC adapters to the effects...now
that's complicated.