I love the Presonus StudioLive series III.. I have a 32SC and also bought a 32SX. If you're looking for a way to save and load a scene to/from and SD card this is the way I've discovered that works. The key is in the Capture screen. Here are the steps:
1. Hit the Live Recording edit button, create a new session, then arm tracks to record (I usually hit All tracks)
2. Record about 5 seconds, stop the recording, hit Save and Close. This will save the scene to the SD card (along with the 5 seconds of unused audio, doesn't require the band to be playing). To recall the scene just load the session and hit Load Mix. It will recall the scene for you.. doesn't even have to be saved to the mixer.
I wish Presonus would explain this a little better but it works! Especially in a club situation where you have multiple users it's a way to backup and load your scenes!
Hope this helps!!