Well both controllers got new power suppliers and new cables. After the main one played silly persons, I went back to the one with the sticky Play button, until it annoyed me so much that I resorted back to the main one again. Now, tonight, I'm out with the FFN, and this is the only time the DDS comes out to play, it feeds analog channels 3 and 4.
A while back, I fed the Surface tablet into channel 3when I was struggling with the controller, and the sound was appalling. I blamed the surface, but tonight, when I used the DDS, it became apparent that the Surface is just fine, it's channel 3 on the VMS that's faulty.
So, just for a laugh, I've got one VMS with a faulty channel, and one with a suspect play button. Marvellous.