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Most power banks won't output power and charge at the same time.
There are USB "UPS"s that will do that, though. They're typically used to run Raspberry Pi projects and are quite a bit pricier than regular power banks.
Maybe something like this?
https://www.amazon.com/ENOFLO-Portable-Charging-Compatible-Smartphones/dp/B0BX8R392P
General UPS are great of medical/server devices too. You can get a generic one and then use software to disable the beep. It's what they are used for. The batteries are even replaceable.
Example: https://www.amazon.com/CyberPower-ST425-Standby-Outlets-Compact/dp/B07GZR981Y/ref=mp_s_a_1_7?crid=1PC2DTQZZGWJ&dib=eyJ2IjoiMSJ9.v54x2i99M6VkWYl8gYCyJpx_BxQQpzTtNeQLrP6mQ8w6Bd7gyUlav6Ql5nFE2tDT-6Y70Tkhaxyn8oMbgDJiQ0WbIHHj5k5MTHHuj_BxBm4vtCPBf6VGTihuuwLshniqvcn-vX-Vr_cA1RmD2EJc-V5stqY3k90oS4SypMAMaDitV3z18DsDiaPNoAReGrAxqheb_lzXsycwkP7YezbPyg.3EVAEzPdF5nTb1n50l9Rad4cNGBW-g6gBCUscRvrVkM&dib_tag=se&keywords=ups&qid=1718411844&sprefix=ups%2Caps%2C303&sr=8-7
I was gonna suggest a regular UPS (some have USB ports), but OP said it was for a noise machine/sleeping, so didn't want to recommend something that would start beeping randomly lol.
Some you can access via the Ethernet and change the settings. Got one of those units and then see if it has the option.
Here's just one tutorial: https://linux-tips.com/t/disabling-ups-beep-under-linux/592
There are many others. Good in places where medical equipment keeps you alive and sleeping.
Yea I've got some Cyberpower UPSs for bigger equipment but it seemed like overkill to add a $100 battery to a $20 noise machine. Plus they're actually pretty noisy on battery mode (they buzz)
How do you disable the beep?
I have six of these in my house and that would be a life saver.