27 Dec
2020
27 Dec
'20
5:32 p.m.
On Friday 11 December 2020 13:10:15 William Morder wrote:
On Thursday 10 December 2020 13:06:05 Dr. Nikolaus
Klepp wrote:
Okay, so maybe an update on this issue is worth posting.
After playing round with all my settings, I discovered that rear mic was
enabled for input source. I didn't remember having changed this, but it's
easy to correct. Once more I set my input source as line-in; also, I turned
down the sound levels for these items. No more hiss, no more feedback, so the
issue would seem to be resolved ... almost.
I restarted kmix and alsamixer, and my settings were preserved; but after a
reboot, the same problems arise again. Input source resets for rear mic
instead of line-in, and the sound level is changed to 100% instead of 0%.
The underlying issue -- why *something* keeps resetting to rear mic, and
changing the sound level -- is the problem. I *believe* that, after
restarting kmix and alsamixer, I ought to be able to preserve my chosen
settings as defaults, rather than having settings revert to something else.
(As I noted earlier, this was never an issue until I upgraded to Beowulf; in
Jessie, I got my settings right, then left it alone, and everything was
always fine.)
I have already tracked down the config file:
/home/<USER>/.trinity/share/config/kmixrc
-- but it doesn't seem to help. The config files in opt
(/opt/trinity/share/config.kcfg/) don't seem to do anything for me.
So how to preserve my mixer or sound system settings through reboots?
Bill
hi Bill!
Anno domini 2020 Thu, 10 Dec 12:47:09 -0800
William Morder via tde-users scripsit:
Hail, Nik! Greetings from my hell of cacophony. I hate noise, unless I make
it myself, in which case I call it jazz.
Thanks for the tip on alsamixer. I don't know when last I looked at it.
I've played round with it a little, and it did help me to enable both
channels on surround (when the right channel was diminished for unknown
reasons). I still haven't figured out the source of the hiss, but I haven't
gone through every possible option yet.
If it worked before without the hiss, then it seems reasonable to expect
that I can restore those settings again. I'll report more, if I find
anything worth telling.
Bill Just wondering if anybody else here has
encountered this problem, and
what to do about it.
When I play an instrument through kmix, I must enable loopback mixing,
but this creates a hiss in the speakers, which in turn tends to create
feedback -- in particular, when I plug in a hollow-body electric
guitar.
This has only been a problem since I upgraded from Devuan Jessie. I
used to play through my computer speakers all the time, using them like
a guitar amplifier. (There is another device, a headphone amplifier,
which I use as a kind of pre-amp.) But otherwise, nothing in my setup
has changed, except that I have upgraded to Devuan Beowulf.
I would like to get rid of that hiss, and I don't remember having to
enable loopback mixing before. I have only recorded a little since
upgrading (using audacity), but it doesn't seem to affect recording
quality too much, because I plug headphones into my computer speakers,
which eliminates both hiss & feedback problems.
Sorry for the detailed presentation; feel free to snip. The main
problem is kmix-trinity, and whether anything has changed between
Devuan Jessie and Beowulf, namely, loopback mixing. Or have I somehow
misconfigured it?
Bill
If I recall correctly the loopbackdevice is connected internally to PCM,
but not to the line-in-plugs. That hising is just noise. Please start
alsamixer and play around with the controls, on some hardware you need to
bring the sound devices into a "good" state before kmix can take over.
Nik