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
hi Bill!
Anno domini 2020 Thu, 10 Dec 12:47:09 -0800 William Morder via tde-users scripsit:
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
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On Thursday 10 December 2020 13:06:05 Dr. Nikolaus Klepp wrote:
hi Bill!
Anno domini 2020 Thu, 10 Dec 12:47:09 -0800
William Morder via tde-users scripsit:
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
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
On Friday 11 December 2020 13:10:15 William Morder wrote:
On Thursday 10 December 2020 13:06:05 Dr. Nikolaus Klepp wrote:
hi Bill!
Anno domini 2020 Thu, 10 Dec 12:47:09 -0800
William Morder via tde-users scripsit:
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
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
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
Anno domini 2020 Sun, 27 Dec 09:32:02 -0800 William Morder via tde-users scripsit:
[...]
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?
I remember this problem popping up some years ago, when the "rise" of systemsd began - what a coincidence. Now I have to add some alsamixer lines with sane defaults to my /etc/rc.local that get executed in subshell with 1 minute delay, so they get applied after anything else. Once I had the great idea to save the sound settings every 10 minutes or so. Turned out to be one of the not so bright ideas, 'cause there are some programs that do bad things to sound settings and don't tell you about.
Nik
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On Sun, 27 Dec 2020 09:32:02 -0800 William Morder via tde-users users@trinitydesktop.org wrote:
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%.
If you have pulseaudio installed, it is quite likely to be causing the problem (especially if it wasn't installed previously). If that's it, either kick the thing to the curb or install pavucontrol or similar and try to configure it that way. (Do *not* on *any* account install pavucontrol if pulse is not already there—it will probably drag pulse in and make things worse.)
If you went from SysV init/OpenRC to systemd on your last upgrade, that would have changed the way ALSA settings are saved and may be the culprit.
Regardless, this is quite likely an ALSA problem and nothing to do with TDE.
Possibly of interest for the large selection of diagnostic commands given: https://unix.stackexchange.com/questions/349613/alsamixer-pulseaudio-choose-...
E. Liddell
On Sunday 27 December 2020 13:07:50 you wrote:
On Sun, 27 Dec 2020 09:32:02 -0800
[ ... ]
If you have pulseaudio installed, it is quite likely to be causing the problem (especially if it wasn't installed previously). If that's it, either kick the thing to the curb or install pavucontrol or similar and try to configure it that way. (Do *not* on *any* account install pavucontrol if pulse is not already there—it will probably drag pulse in and make things worse.)
If you went from SysV init/OpenRC to systemd on your last upgrade, that would have changed the way ALSA settings are saved and may be the culprit.
Regardless, this is quite likely an ALSA problem and nothing to do with TDE.
Possibly of interest for the large selection of diagnostic commands given: https://unix.stackexchange.com/questions/349613/alsamixer-pulseaudio-choose -internal-mic-over-mic-jack
Thanks for the link!
E. Liddell
No -- I have long since purged pulseaudio and all its evil spawn. My brief experience of pauvucontrol taught me to avoid it at all costs, and anyway, it's connected to pulseaudio. Likewise, no systemd on my system.
Ever since KDE3, I've only used alsa, and pulseaudio only sometimes by mistake; and after going to Devuan a couple years ago) only sysvinit. I never used OpenRC or other options, only sysvinit. I regard systemd as a sure sign of the Last Days approaching. ;-)
The settings in kmix-trinity get changed on reboot, which makes it a TDE problem; although, however, E suggests, the source of that problem may lie elsewhere. Anyway, it's not a crucial problem, just annoying that I must manually restore my kmix-trinity settings on every reboot.
Thanks to Nik and E. Liddell for their help. Also thanks to Leslie for reminding me of .trinity/share/config/kmixctrlrc. I don't know yet if this will help, as I have no other need to reboot at the moment. (When running Devuan on a desktop machine, things get almost *too* comfortable sometimes, and I might not ever reboot unless my neighbor blows the fuse again. Which reminds me: I really need to find a power supply backup!)
Bill
On 2020-12-27 11:32:02 William Morder via tde-users wrote:
On Friday 11 December 2020 13:10:15 William Morder wrote:
On Thursday 10 December 2020 13:06:05 Dr. Nikolaus Klepp wrote:
hi Bill!
Anno domini 2020 Thu, 10 Dec 12:47:09 -0800
William Morder via tde-users scripsit:
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
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
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
There is also .trinity/share/config/kmictrlrc, which on my machine has entries for rear-mic and rear-mic-boost; see if that has pertinence, and perhaps make it read-only once the settings are right?
Leslie --
-
Dr. Nikolaus Klepp -
E. Liddell -
J Leslie Turriff -
William Morder