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Groups > comp.os.linux.misc > #66669

USB MIDI device plug-in changes sound volume

From Chris Ahlstrom <OFeem1987@teleworm.us>
Newsgroups comp.os.linux.advocacy, comp.os.linux.misc
Subject USB MIDI device plug-in changes sound volume
Followup-To comp.os.linux.misc
Date 2025-03-27 09:21 -0400
Organization None
Message-ID <vs3jcg$4scl$3@dont-email.me> (permalink)

Cross-posted to 2 groups.

Followups directed to: comp.os.linux.misc

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Been happening lately on my Debian Sid mini-PC. It has a USB-to-headphone
adapter [1] plugged in the back (USB 2), a USB 3 hub plugged into the front
via a USB-C to USB-B adapter, and another USB 3 hub plugged into that hub.
There are various USB-MIDI controller plugged in, plus a (currently unused)
USB audio codec from Behringer.

So I take one device (Korg nanoKey2) and plug it in. The volume drops.
I turn it up via alsamixer. But it would be nice to figure out what is
happening.

[1] This adapter is a Philips product bought at Target. In alsamixer,
it is called "iStore Audio". In pavucontrol, it's called "AB13X Headset Adapter
Analog Stereo". Via lsusb it's called "Walmart AB13X Headset Adapter".

-- 
It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to
mathematics, though she is still forbidden to resort to physics and chemistry.
		-- H. L. Mencken

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USB MIDI device plug-in changes sound volume Chris Ahlstrom <OFeem1987@teleworm.us> - 2025-03-27 09:21 -0400

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