The Openbox works wonderfully with USALS, in my experience. My motor is a Powertech DG-280.
As to the DTS issue: When the DVB-S2 Russian mux on 99W Ku was partially unencrypted, the Openbox said that the audio was DTS on the banner at the bottom of the screen, and it played. However, on the PID display screen (after several clicks of the Info button), it said that the audio was AAC. Does DTS incorporate AAC? I've never bothered to research it.