I'd add an additional advice, related to the condition. I'd modify the posted IfCondition, this way: IfCondition=#CURRENTSECTION#>=23.3. The added > sign doesn't do anything in most cases, but in some circumstances it might become important. These cases might be one of the following:
The computer is put on sleeping at the given moment. Not absolutely impossible.
The computer is heavily loaded at the same moment.
In both cases the skin might jump over the moment given into the IfCondition option. In this cases with the condition wrote only with the equality, the IfTrueAction is not executed. If you modify the condition as I described above, the IfTrueAction is executed anytime after the moment given by the IfCondition.
Given that this little modification doesn't hurt, I recommend it, to avoid cases when the skin avoid executing the bangs used into the IfTruAction option.
So that the action is triggered even if the PC is turned on sometime in the middle of the night.
Also allows an IfFalseAction to automatically increase the volume after 7:30am.
PS: Wouldn't this be easier to do with Event Viewer?
So that it only asks "What time is it?" every 60 seconds, and the IfCondition is re-checked every 60 seconds. This would make sure the volume is set to 10 though fair-warning if you wanted to increase or decrease the volume in the night every 60 seconds it would change back to 10. I'd get pretty annoyed with that pretty quick.
Personally I think you're way better off just using Event Viewer for this.