Good day to all !
Finally, I achieved complete MQA decoding with my GUSTARD X26 PRO DAC. Although I must admit I solved this problem by accident.
Just yesterday I deleted the driver for the DAC from the computer, and decided to reinstall it.There are two drivers on the disk supplied by the manufacturer, one is version 4.82.0, and the other is version 5.0.0. I decided not to set both of them like I used to about only one of them. Perhaps the installation of two drivers at the same time was a problem for the normal operation of the DAC (I will immediately make a reservation that I am not an expert in computer technology).
So first I checked the work of the DAC with the 5.0.0 driver. In the ROON player, on the audio settings page, the DAC was detected in WASAPI EXCLUSIVE mode, in ASIO mode, the DAC could not be detected. But even with WASAPI EXCLUSIVE, when installing a decoder and a renderer, the DAC started playing MQA without any problems, without interruptions (before, the MQA icon switched to PCM chaotically, but now it burned constantly).
What do I do next - I re-uninstall the Gustard driver from the computer and install another one, the one that is 4.82.0 and now in the ROON player settings except WASAPI EXCLUSIVE, the DAC is detected in ASIO mode, and in both MQA modes it is again reproduced without problems (display on dac shines MQA constantly).
In WASAPI EXCLUSIVE mode, there is now a display of a full MQA decoder (In ASIO ROON mode, this does not show, but as they say in ROON support, this is how it should be, the MQA DAC displays)
And although it is impossible to distinguish WASAPI EXCLUSIVE from ASIO by ear in my setup, both sound equally great, but left out the ASIO output option, as experts claim it is better.
P.S. Maybe what I have described is not valuable information for people who understand computer technology, but it may still be useful for dummies like me .......Sorry for my english, i use google translator