alsamixer allows me to adjust the mobo headphonejack left&right channels
independently, however for some peculiar reason alsamixer locks the
left&right channels together for the arctis 7 headset.  that might make
sense for a mono device, but this is a stereo headset (tho is configured
with stereo and mono outputs and mono mic).  i can hear stereo separation
just fine, but one side is annoyingly weaker, so i want to adjust the
balance.

or in pavucontrol, tho in pavucontrol i don't see how to independently
adjust left&right channels for any other device either.

can anyone suggest where to look for what to tweak?  these are what i've
found so far, tho it's not clear to me what if anything can be done with
them:

$  head -99 /u*/s*/p*/a*/p*/*s-7* /e*/ls*
==> /usr/share/pulseaudio/alsa-mixer/paths/steelseries-arctis-7-input.conf
<==
; Steelseries Arctis 7 USB headset microphone path. Works also with Arctis
Pro
; Wireless.

[General]
description-key = analog-input-microphone-headset

[Element Headset]
volume = merge
switch = mute
override-map.1 = all
override-map.2 = all-left,all-right

==>
/usr/share/pulseaudio/alsa-mixer/paths/steelseries-arctis-7-output-mono.conf
<==
; Steelseries Arctis 7 USB headset mono output path. Works also with Arctis
Pro
; Wireless. The headset has two output devices. The first one is mono, meant
; for voice audio, and the second one is stereo, meant for everything else.
The
; purpose of this unusual design is to provide separate volume controls for
; voice and other audio, which can be useful in gaming.

[General]
description-key = analog-output-headphones-mono

[Element PCM]
volume = merge
switch = mute
override-map.1 = all
override-map.2 = all-left,all-right

==>
/usr/share/pulseaudio/alsa-mixer/paths/steelseries-arctis-7-output-stereo.conf
<==
; This path doesn't provide hardware volume control, because the stereo
; output is controlled by the PCM element with index 1, and currently
; PulseAudio only supports elements with index 0.

[General]
description-key = analog-output-headphones

==>
/usr/share/pulseaudio/alsa-mixer/profile-sets/steelseries-arctis-7-usb-audio.conf
<==
[General]
auto-profiles = yes

[Mapping analog-mono]
device-strings = hw:%f,0,0
channel-map = mono
paths-output = steelseries-arctis-7-output-mono
paths-input = steelseries-arctis-7-input

[Mapping analog-stereo]
device-strings = hw:%f,1,0
channel-map = left,right
paths-output = steelseries-arctis-7-output-stereo
direction = output

[Profile output:analog-mono+output:analog-stereo+input:analog-mono]
output-mappings = analog-mono analog-stereo
input-mappings = analog-mono
priority = 5100
skip-probe = yes

==> /etc/lsb-release <==
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.4 LTS"
$  dpkg-query -W alsa-utils pulseaudio pavucontrol
alsa-utils      1.1.3-1ubuntu1
pulseaudio      1:11.1-1ubuntu7.4
pavucontrol     3.0-4
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