As the title says, really.
 
I have a VST I'm testing, which has a very basic UI.
 
Some of the functions are not accessible via the UI, but only with it swiched-off, which then reveals the full list of control parameters.
 
I can turn-off the UI in Reaper, but can it be done in Sonar?

If you add a plugin to a track, it is running.  If you don't want to see the UI then either don't open the UI, or close it if you already opened it.

I'm not exactly sure what you question is? Unless you meant to say a Plug in,
Plug ins have on/off switches and you can also by pass the bin which would be Sonars technique. 
But a VST instruments it would seem would not include an on/off switch as I cannot see what purpose it would serve. You mute the VST track if you don't want to hear it. 
 
Oh, and your signature caught my attention. 
I think a lot of people put way to much info in their signatures. The basics is all that is needed. I just love the ones that even put the Brand of the RAM.. 
 

If you hold down shift while single clicking a loaded plug in, Sonar switches ACT focus to it without popping up the UI. That's all I know.

He's asking how to load a GUI-less instance of the plugin.
Sorry, I haven't heard of this feature in Sonar. Maybe there are some settings in initialization file, IDK.

chris.r
He's asking how to load a GUI-less instance of the plugin.

But what on earth for? Just open it, and close the interface.

ooblecaboodle

chris.r
He's asking how to load a GUI-less instance of the plugin.

But what on earth for? Just open it, and close the interface.

He is asking because he has a plugin that exposes additional controls when the plugin GUI is disabled.  Reaper has had this for a long time but I have not heard of it being available in Sonar.  The one thing you could investigate is if the additional parameters can be controlled via midi. 
 
 

Or as track envelopes.
 
If it's 32 bit and you're using 64 bit SONAR, I seem to remember BitBridge can expose the non-GUI UI.  And I think some of the plug-in chainers/containers can (eg. Blue Cat) - I know the old 32 bit Chainer could.

karhide

ooblecaboodle

chris.r
He's asking how to load a GUI-less instance of the plugin.

But what on earth for? Just open it, and close the interface.

He is asking because he has a plugin that exposes additional controls when the plugin GUI is disabled.  Reaper has had this for a long time but I have not heard of it being available in Sonar.  The one thing you could investigate is if the additional parameters can be controlled via midi. 
 

I don;t understand that at all. How on earth are you meant to control it?

ooblecaboodle
I don;t understand that at all. How on earth are you meant to control it?

 
Answering by quoting from the 1st post:
 

gadget
Some of the functions are not accessible via the UI, but only with it swiched-off, which then reveals the full list of control parameters.