There is a technical problem caused by EZ Drummer 2 that is preventing me from freezing tracks; but that aside, I don't understand why I can't record the audio tracks of that product or another VI.
 
When I have a split instrument track with a MIDI track and an audio track, why can't I simply put the audio track into record mode and record the instrument in real time.  Why isn't there a record button?
 
I created another audio track, but the minute I selected the synth as a source, it lost the record button.  Sonar also does not allow sending the output of a track to another track.
 
This should not be so hard.  I can record external synths.  Why not internal ones?

It is a frequent question about SONAR's design that can only be answered by the developers. There are ways to record soft synth audio output http://forum.cakewalk.com/FindPost/3000845 but they all have their limitations.

People have been asking for this for years and I don't recall anyone from Cakewalk ever offering any kind of response - I can only assume that for some reason the internal architecture of Sonar is such that the implementation of such a feature would be a large undertaking. I for one would love to see it though. Others have previously offered various workarounds including the use of 3rd party plugins which can record synth audio, and setting up a loopback on your audio interface if it has this ability.  

It is one of the reasons I buy audio interfaces with more I/O than I really need so there are spares for loopback.

However konradh, if you're just looking to create a .wav of an EZD performance that's being driven by MIDI, you could just export the audio from the export function in the file menu, right? 

Good thought, but here's the problem.  When mixing, I need a high ASIO buffer (like 1028) so I don't have pops or drop-outs; but when using MIDI, I need a low buffer to avoid latency.  If latency were not a problem, I could just export the whole song and I would be done with the mix.
 
Since EZ Drummer 2 has screwed up the freeze function, I don't have a very good option.
 
Maybe I could try your idea by muting all the other tracks or something to see if a medium high ASIO buffer would work.
 
I am trying to get an album off to the mastering engineer and Toontrack has really screwed me up.   Thanks for the reply and idea.

In the export dialog you can just select the track you want to export, you don't need to export the whole mix. 

if a synth won't freeze correctly. just select the track that has the audio and the track that has the midi and then select the time on the timeline. Go the the clips menu and choose bounce to tracks. This works if the synth has multiple output audio tracks as well. I do this regularly with JamStix.

This was recommended on another thread.
Virtual Audio Streaming by DDMF.
http://www.virtualaudiostream.com/
 
I tried, then purchased and used in another application, it worked great.
$29 U.S.
There is a demo version, but it places bit of noise in the audio track.
Not sure if it can be 24 bit
Just another thought!
 

If you select only that audio and midi track, and export them, they are the only things that will get exported.
 
The native feature for direct recording of the output of a soft synth is not yet part of Sonar, but bouncing the midi to an audio track, or exporting as noted above should give you the desired audio output file.
 
Bob Bone