There may be a few things going on here:Sounds like your triggering a dummy nothing is actually being turned on/off !
1: I use the timers very little but there may be a bug with the 10 min interval at 6:30 am! If this is true try changing the time from 10 min to more say 20 min!
You may have to trigger on at 6:29 as well
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2: Also if your seeing a signal going out X10dispatcher should be catching this
Have you checked the log in X10dispatcher to see if it is seeing the signal?
3: Check your settings in X10dispatcher to be sure the time you wish the sound to fire isn't in the quiet time (if you have that enabled).
4: There are a lot of options with X10dispatcher so double check your setting in it, it is easy to over look something!