On 10/10/2013 07:42 PM, Lars Luthman wrote:
On Thu, 2013-10-10 at 20:37 +0200, Lars Luthman wrote: 

I would just bypass the LV2 host altogether and use shared memory to get
the audio data to the GUI.

...and use the same mechanism to send the sample rate.
LV2 UIs can get the sample-rate using the options extension.
Hosts will set the appropriate option lv2param:sampleRate which the UI can get on initialization.