I have the Focusrite Saffire 24 Pro and have the latest Mix control installed 3.4. When I change the record buffers either in Sonar or from the mix control the change is not reflected. Not a big issue or anything like that but it used to work. It hasn't worked even prior to updating Mix control which has been updated a while now. It does it in Studio One. Just curious if anyone noticed this.

Is there some sort of 'Apply' button?
 
I have never seen or heard of this particular issue - though I am a small piece of kelp in a big ocean.  :)
 
Bob Bone
 

I do dimly recall that some interfaces need to be power-cycled when buffers are changed.  Have you tried that?
 
Bob Bone
 
 

Shouldn't need a power cycle.
Are you using ASIO?
Try saving the settings to hardware.
If all else fails uninstall mix control reboot, download mix control again, reinstall then perform a hardware reset.

If you're looking at what the transport says, that's a different setting I believe. File->Audio Data->File Bit depths.
 
edit: re-read and see that you're talking about buffers.

CakeAlexS
Shouldn't need a power cycle.
Are you using ASIO?
Try saving the settings to hardware.
If all else fails uninstall mix control reboot, download mix control again, reinstall then perform a hardware reset.

Yeah Alex I am using ASIO and I did just for the sake of it un-install and re-install the mix control and re-booted but I didn't do a hardware reset. Are you referring to just powering the unit on and off?

I meant just a 'cycle' - just to reload the drivers.  That can be done on many interfaces by just disconnecting its USB cable and plugging it back in after a few seconds, and on some PCIe cards it means a reboot, whatever you need to do to reload the drivers, to take on the new settings.
 
This is also not required by all interfaces - the percentage may be quite small, or these days not even a requirement.  It is just a thought, as the above used to sometimes be the case.
 
Bob Bone
 

Record and playback buffers are different from your ASIO buffers. There 2 different types of buffers. That is why its not changing, because you are changing the wrong buffer. The record and playback buffers are not set by your sound card. They can only be set by changing them in Sonar. 
 
CJ

Good point, I misread this: "hasn't worked even prior to updating Mix control".
 
.. need more info as to exactly where you are changing this setting and what specifically the setting is called..
ASIO will lock out some settings, I'm guessing Studio One is not an ASIO driver? Anyway sounds normal.

The record i/o buffer size in Sonar "preference sync and caching" does reflect the ASIO buffers. The playback buffers obviously do not. I know that the record buffers have to be the same as the ASIO buffer size or you will get a drop out error. At least if you change either buffer while in the project you'll get a drop out error. I do. In Studio One it's called the Block Size and it changes when I change the Asio buffer in mix control. It worked in X2 aqnd X1. Then I was using the presonus Firebox so not sure if it matters which interface you use. In mix controle there is a button settings and one of the settings is ASIO Buffer Size. I suppose some interfaces require changing buffers manualy.