This page describes how to modify the HR2510 button press bleep volume
It is easy to decrease the volume of the bleep that you hear when you press any buttons on the HR2510, just locate the brown wire at pin 4 of J302, to completely shut off the bleep cut the wire, to just reduce its volume at a resistor in series with the wire, according to the person that sent me this mod a 150KOhm worked nicely, but you may need to experiment to get the level you require.
Thank you to moslef for sending me this info, and RogerBird for knowing the answer !
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