Mackie DL806 Reference Manual page 107

Step 7 — Setting channel safes: Let's give it a shot to understand how this functions a little better.
A common scenario for using channel safes is on outputs. This way, the settings on all input channels
will recall, but the output settings [graphic EQ and output compressor / limiter] will not. Select all
outputs (as seen in the image below).
Now that we've set channel safes, go ahead and recall the snapshots again [step 6, previous page].
There should now be no changes to the output settings when recalling any of the snapshots
(assuming, of course, that you made changes to the outputs when creating the snapshots [step 4,
three pages back]).
Step 8 — Remaining snapshot popover choices: You might be wondering what the other snapshot
popover choices accomplish. Well, you're in luck, as here they are!
Replace — Saves the current state of the console over the selected snapshot. This is useful
in situations where the settings on a snapshot might be close to where you want them,
but not quite exactly where you want them. Make your tweaks, then select "replace" to
replace the snapshot with the updates for next time. A confirmation dialog will appear.
Delete — The delete button deletes the currently selected snapshot. This is a permanent
deletion with no undo, so a confirmation dialog helps prevent accidents.
Mackie DL806 and DL1608 Reference Guide
107
DL1608 Channel Safes