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 -- ____________________________________________________ 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
