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 ____________________________________________________ tde-users mailing list -- users@xxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxx Web mail archive available at https://mail.trinitydesktop.org/mailman3/hyperkitty/list/users@xxxxxxxxxxxxxxxxxx
