In configuration #2 both seem to be controlling the DAC though. The only conclusion I can draw is that the ESS controller must be attached to the DAC isolated GPIO header for all 3 displays to work correctly and output music. O 2.4" LCD display attached to the StationPi Pro connector. O MonitorPi attached to Q7 non-isolated GPIO header. O Original ESS controller attached to the isolated DAC GPIO header. If I swap the ESS controller display with the MPi all seems to be well O MonitorPi attached to DAC isolated GPIO header. O Original ESS controller attached to the non-isolated GPIO header on the Q7. The selection LCD is optional, and when attached as shown, it does display the FiFo data in the lower right-hand of the screen. With all of my testing and retesting, the only way to get music - with displays attached - is with configuration #2 as noted below My apologizes if this information may have been covered elsewhere in the forum/thread. I will admit upfront that some of the issues may be unwittingly user introduced. My core audio stack includes the following Ian RPi HATs StationPi Pro > FifoPi Q7 > Dual Mono DAC > Transformer Output to RCA, and ancillary displays as mentioned above. Those would be the ESS Controller, MonitorPi and the 4D Systems LCD panel. My primary goal is to get all 3 displays working together properly. Finally getting some of my DAC projects ready to leave my bench but still have some lingering questions.
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