Batboard

I have two GTX 900 MHz HT's with DTMF pads. I need to send DTMF sigs to my repeater controller, but all I get is a single low freq beep when I key the radio and hit a key.
Is there some toggle in the RSS I need to set to enable the tones ?
I don't have the Software Manual for the GTX.

Thanks, Dick, W1KSZ

Thanks Shaun, it worked on one. The other shows a slightly different menu when I read the CP. Its due I think to a small difference in the Model Number (CU1 vs CB1).
But at least I can get started.
Now if only it also had the A-B-C-D buttons ...

73, Dick, W1KSZ