There is something (issue) related with Nebula SRC and plug-in(s) host/mini-host. Also all those mini-host plug-ins show the same behavior. FXP VST/RTAS adapter is not a mini-host plugin but will not be a AAX FXP adapter
Enrique Silveti. Acustica Audio customer and technical support.
the real trouble, nebula doesn't allow changing of frequency rate if a program is already loaded unless you load again your preset. We could add a step for reloading a preset but it would not be a good idea (we tested this solution too), otherwise even a little adjustment of rate (like most of audio cards are doing) will force this sort of nebula reloading: it could lead to crashes, especially if hundreds of nebula are reloading programs at the same time cause a frequency rate switch. Keep in mind many professional audio cards I tested change this frequency rate at runtime especially if synched with external clocks.
We tested each main host (cubase, reaper) in order to force the righ frequency rate BEFORE nebula loads a saved preset. The correct path is: 1) something forces nebula frequency rate 2) a saved chunk is sent to nebula, so it forces preset loading at the correct frequency rate.
Many chainers start nebula sending this saved chunk BEFORE they update the correct frequency rate.