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Soundcraft UI24R - Power switch. Power on and off at mixer.

Question: Does it matter when shutting down the mixer, whether you use the onboard "on&off" switch on the side of the unit, or just shut off power from the power receptacle source? Our band has been using the UI24R since 2019 with success aside from the standard wireless issues and occasional glitches, very solid. The mixer is rack mounted. We use a UPS for the mixer power and normal shut down sequences; Mute all, save show, power down speakers and floor wedge monitors, turn off switch inside of the rack on the side of the mixer -OR- turn off UPS without turning off the switch, we have used both methods. Does it matter if the switch is turned off or is it okay to power down externally using the UPS only. There was speculation or rumor by someone that disconnecting power externally without using the mixer switch could cause a corrupt system? I need a Harmon Technical person to please advise ASAP.

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