Just for information : After some investigations, when I connect the Audya to PC with the USB cable, and of course set USB MIDI ON, the MIDI CLOCK IN simply does not work.

When I use standard MIDI Cables to AUDYA MIDI IN 2 (keyb) and let the MIDI PORT IN KEYB 2, the syncro is working but ONLY WITH STANDARD PATTERNS

If you select a style with audio drums, the style is not in sync at all

So there is 2 bugs in Audya : MIDI CLOCK IN does not work with the USB cable and does not work with audio styles