Thanks for confirming, @milasx. My main issue was that the fan was either completely switched off (when, ironically, it was in “Always On” mode), or did its constant “revving-up” thing while in “Normal” or “Positive”. I’m normally not a fan of fan noise (pun intended), but the scratching and ticking sound really became bothersome, even when it was in the other side of the room.
I’ll try a firmware upgrade, but obviously wanted to make sure if there were adverse effects in doing this beforehand, since some users reported that the Odyssey was left in an unbootable state after doing so (which is – shall we say – suboptimal)
btw. did you also remove the CMOS battery as the guide suggested (presumably to set it back to factory defaults)?