If you want to play a guitar/keyboard/scat vocally in real time, just set up SONAR to do that.  You'll need more inputs - one for each line you want to record.
 
I don't think you can record in SONAR from Audacity - that would be like typing in MS word directly to this forum.  One program can have focus at a time.
 
SONAR is a more complete program than audacity - you should be able to do anything in SONAR you can do in audacity, unless it involves a program tied to audacity (like melodyne to SONAR).  Although I must say, I still don't understand what you are trying to do.
 
@

Okay, I have a composition and I play it from Sonar...drums, waves, softsynths ect...usual stuff. I want to record it for a CD - for example. I use Audacity - used to be able to do this with Creative Elite Pro. Anyway, so I'm recording away and I want to include a softsynth line, or a live guitar/vocal etc as I'm recording. That's essentially what I'm trying to set up with the Quad, which I could do with Creative.
 
The line/vocal etc that I'm playing in real time, only goes on the CD as I'm recording and not into Sonar - even though I might have 2 or more tracks saved as the main comp.
 
I guess I'll work around it. I mean how to others record their compositions for CD/Web/videos? Do you just export it as a wave?
 
 
 
 
 
 
 
 

Yes. I don't really understand your workflow logic, to be honest. "Normally" you just record and mix all parts until you feel happy with the total, then export as WAV (or something else). As for Nectar, if you have it as a plugin it should be available in Sonar and you can record and automate to your heart's content. I don't understand why you would need to use Audacity for this at all?
Are you saying you bypass/unbypass Nectar during playback or something? If so, you can automate that in Sonar or setup a controller to record it.

I'm stumped as well. I don't understand at all what is the use of Audacity in this context, or maybe I've simply misunderstood your goals.
According to what I've "understood" I would simply put Nectar on the vocal track and automate the harmonics, as Sanderxpander suggests. If automation can't be done (I've never used Nectar), then copy the vocals on another track (or several tracks) and do the harmonizing on those tracks with Nectar.
Basicly, putting Automation Write on, playing back the track  tweaking Nectar, should do the job.
 
 
 
 

It sounds to me like you don't understand that you can record your realtime performance, singing, scatting, voice over, etc. on to a new audio track in Sonar. You can what we call overdub or multitrack as many additional tracks as you want. Just right click on the empty space where you see your soft synths or drum machine track. You will get a prompt to add an audio or midi track. Add an audio track. You have to set up the in and out for your mic. Then you just hit record and your good to go. I see no mention of headphone monitoring. Be advised, you will hear the audio from your speakers being recorded at the same time in the background of your new audio track. You must have headphones to hear and make sure your speakers are cut down. 
You can add as many tracks as you want. When you are finished you mix down ALL of the tracks in Sonar. When your done you will save or import the master wave file where ever you want. Or you can burn your project directly to a cd from Sonar.
You don't need Audacity at all. It is a huge waste of time doing so.
I would suggest doing some searches on the web about overdubbing and multi tracking first so you may better understand the process. I will watch for your posts here and if there is any way I can help let me know! Good luck, my friend! It is never easy changing an old workflow to a new but once you understand the power and capability you have in Sonar you will never turn back. JUST BE PATIENT!

BTW, as mentioned before just copy your original track to a new track and add Nectar in the FX bin. This will allow you to work on your vocal tracks.
 

Good point about copying the vocal track. You can create a new audio track and copy the vocal and paste it into the new track or you can clone the original vocal track and then archive the original. It is always a good idea to keep an original track just in case you mess it up. That way you can start over if you have to.
 
Groove 3 has videos you can learn from to get the most out of Sonar. I recommend them as I'm sure many here will as well.

I think the point of copying the vocal track was to create a harmony by pitch shifting through Nectar.

Thumbs up on saving the original vocal track! And yes, Sander, the point is to keep the original track in this case so you can copy that vocal track and then manufacture the harmony with it.

Thanks for the helpful tips guys. Sidroe thanks for you in-depth advice. I haven't done a lot of overdubbing, although I did try to set this up the other day with an audio track and wasn't able to configure it successfully. That would indeed meet my goal. Once I had this track, I was going to experiment with Stutter Edit for real time effects. I am very patient with this stuff...I love it and get a lot of satisfaction and joy when something wonderous is created.
 
And yes it occured to me today to just clone the vocal wave and cut the unwanted and just have pitch shift for those parts...duh! It's quicker doing this than Melodyne - although the latter is probably better with silibance editing - and Nectar 2 is a much better piece of software for things like this than the previous version.
 
So, goodbye Audacity, you served me well.
 
Cheers