Anderton
Well, if you save a preset immediately before freezing, unfreeze, and the preset parameters are different (and not just due to something like LFO randomness), then there is an actual problem. I'll test it and see what happens. Can you tell me which preset it is? Or are you saying it happens with all of them? Is it just the ADSR on the filter, or other parameters as well?
 
Hmmm...I don't see a Muzeum bank under the classic content or factory content. Where is it?

hi Anderton,
Yes, I am saving the preset before freezing and yes it is changing preset parameters such as ADSR, not LFO randomness or anything in the matrix.   I am attaching the preset here:
 
https://www.dropbox.com/s/33lno3qj60k4yzs/Patch001.fxp?dl=0
 
 
Thank you for checking this out!

I've seen the phenomenon before, going back to at least SONAR 5. I don't think it's SONAR's fault, or at least not a recently-introduced bug.
 
The question I have for CW devs is: what does "unloading" a synth really mean? How do you unload a synth from the project, leaving only a placeholder, without losing the synthesizer's state? Most of the time, you apparently can. I can't tell you which synths are prone to this problem, because after the first couple of times I got burned this way I got into the habit of saving presets before freezing.

Sorry, SBM, we were both typing at the same time. So you're saying that after unfreezing the patch itself has changed?

Good point.  It is so random too.  Some synths never have this problem, some do, sometimes its only certain patches... i can't find any rhyme or reason.

on the patch i gave, watch the Amp Release parameter having freezing.
 

Okay, I just froze and unfroze about a dozen times with your preset as well as several others. All the envelope parameters, in fact all parameters I checked out, were identical. What IS different is when you unfreeze, if you had an envelope selected prior to saving, it won't return to the envelope that was selected prior to saving. For example if in your preset I select envelope 3, save, freeze, and then unfreeze, envelope 3 will not be selected; instead I'll see the envelope for the Amp.
 
Are you SURE actual parameters are changing, and not just the visuals because a different envelope has been selected? If so, then I need a recipe to reproduce because freezing/unfreezing is working as expected, unless you expect what you had selected prior to freezing to remain selected after freezing. As Bitflipper points out that may be a function of unloading the synth to save resources, which is the objective of freezing.

bitflipper
Sorry, SBM, we were both typing at the same time. So you're saying that after unfreezing the patch itself has changed?

Correct. The Amp release is very noticeable before and after a freeze with the patch I supplied

Anderton
Okay, I just froze and unfroze about a dozen times with your preset as well as several others. All the envelope parameters, in fact all parameters I checked out, were identical. What IS different is when you unfreeze, if you had an envelope selected prior to saving, it won't return to the envelope that was selected prior to saving. For example if in your preset I select envelope 3, save, freeze, and then unfreeze, envelope 3 will not be selected; instead I'll see the envelope for the Amp.
 
Are you SURE actual parameters are changing, and not just the visuals because a different envelope has been selected? If so, then I need a recipe to reproduce because freezing/unfreezing is working as expected, unless you expect what you had selected prior to freezing to remain selected after freezing. As Bitflipper points out that may be a function of unloading the synth to save resources, which is the objective of freezing.

 
Oh I am very sure, it is changing the actual release time of the note.
 
I will take a video of this, (but it will not have sound)... but I will show you shortly.

A couple other things...I don't see any envelope assigned to filter in the modulation matrix. The amp envelope release stays constant at .08 seconds no matter how times I freeze or unfreeze...
 

Here is the video:

https://youtu.be/AMv5OCg1kVo
 
It is clear the AMP Release knob is BELOW the 50% mark before the freeze, yet ABOVE it when unfreezing.