AutoRemote Notification sound

I've set all the notification sound settings to None, but AutoRemote still makes a sound when a notification arrives. Is this a bug or am I overlooking a setting.

 

Preferences -> Alerts -> Notifications
And then I set Default Sound and every Sound 1 - 10 option to None

A sample of what is being sent that causes this is:
https://autoremotejoaomgcd.appspot.com/sendnotification?key=mykey&title=title&text=text

The sound I get is not set anywhere else on my phone, as far as I can tell, and I've never heard that particular sound until after I installed and setup AutoRemote.

If I change the Default Sound setting (in AutoRemote), then I get the sound I choose. If I set the Default Sound setting back to None, then I get this unspecified sound that sounds sort of like a single strum on a zither.

 

Here is what I've discovered that leads me to believe it's in AutoRemote. I have the AutoRemote Default sound set to None.

If I use the URL:
https://autoremotejoaomgcd.appspot.com/sendnotification?key=mykey&sound=0&title=title&text=text
Then I get the notification and no sound is generated. If I use the same URL, but leave out the sound parameter, then I get the previously indicated sound. This leads me to believe that when the sound parameter is missing from the URL, then AutoRemote is failing to lookup the Default sound properly.

At this point, I've found that specifying sound=0 is a workaround.