I emailed iZotope support to ask about setting up VocalSynth2 in Cakewalk BbBL/Sonar and received this very disappointing reply:
(My italics below)
"Thanks for reaching out to iZotope Customer Care. Please be advised that Sonar is not a supported host for VocalSynth 2. Supported hosts include Logic Pro X, Ableton Live 9-10, Pro Tools 10-2018, Cubase 9.5, FL Studio 12, Studio One 3, Reason 10, Reaper 5, and Bitwig Studio 2.
While you may be able to achieve partial functionality, the product’s behavior and performance will likely be unstable and unpredictable. For these reasons, iZotope cannot provide support for this workflow.
I apologize for any inconvenience. For your reference, full OS/DAW compatibility information can be found here:
https://www.izotope.com/e...design/vocalsynth.html *Specs found at the bottom of the page
I hope this information is helpful. Please let me know if I can be of any further assistance, and thank you for being an iZotope customer!"
It seems they'd completely written off Sonar before it was even acquired by CbBL. The response explains why I was getting appalling sounds from the demo. The final 'have a nice day' line made me laugh. Well, as it happens I remain an iZotope customer because of their excellent Ozone8.