When all else fails, RTFM.
I’ve finally managed to get the external audio from my SC-88 Pro and my Kawai K5000R into the computer along with the output of my software synthesizers (VSTs such as Kontakt, etc.) without having to do any hocus-pocus to connect everything to Adobe Audition for recording.
The solution was more-or-less simple and takes place inside of Cakewalk Sonar Platinum. I merely had to set up an audio track, arm it for recording, make sure that “Direct Monitor” was switched off on the Focusrite Scarlett 2i2, and then hit the master record button inside of Sonar. All my external synths get recorded to the armed audio track, in sync with the soft synth playback.
The next step was to “freeze” the soft synth tracks (i.e., render them down to WAV files). Once done, I selected File|Export and told it to mix down the entire song. Bingo! Instant stereo WAV file, which I can load into Adobe Audition and edit to my heart’s content.
There you have it. No ASIO tricks, no routing software, no “wrappers.” Just record, render, mix, and edit. And to think it was all in the online Sonar manual. (slinks away quietly to hide from stone throwers)
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