I replied to your email regarding SONAR support, which I've copied here for reference:
mdyde wrote:...
The AU/VST hosts that we officially support and test with are listed here:
https://www.hauptwerk.com/clientuploads/documentation/PDF/HauptwerkPrerequisites.pdf
We don't officially support recent versions of Sonar, or have first-hand experience with them, but I know of no reason that Hauptwerk's AU/VST Link wouldn't work in them.
Hauptwerk runs as a stand-alone application, optionally using its 'Hauptwerk AU/VST Link' plug-in to route MIDI from, and audio to, an AU/VST host application. I'd recommend starting by having a read through the 'MIDI sequencing, the Hauptwerk AU/VST Link and applying real-time reverb' section in the Hauptwerk user guide (on the Help menu in Hauptwerk, or on-line here: https://www.hauptwerk.com/support/documentation/ ) -- pages 181-199 in the current v4.2.1 version.
The 'Composing pieces off-line from a MIDI sequencer configured conventionally (Hauptwerk as a ‘slave’ MIDI device)' sub-section (pages 189-194) has step-by-step instructions for how to use Hauptwerk in conventional MIDI sequencer environments, such most DAW/sequencer users would probably want to use.
Note also that it's very important that you only have a single instance of the Hauptwerk plug-in loaded within your host's project, since it wouldn't normally make sense to have multiple independent pipe organs within a single project, and Hauptwerk doesn't allow multiple simultaneous plug-in instances. (The user guide covers that in more detail.)