Mark,

Create a macro on the processor that will invoke a play command to the unit.

On Processor, click the events tab, then "create periodic event"

Select the macro from drop-down and select to run every X minutes

You can make the macro smarter by using the event control option or you can run at certain time of day, or test on other conditions. Be sure to give yourself a button to enable and cancel the event on the remote if you need to.