On Tue, 21 Dec 2021 19:56:32 -0800, Paul A. Steckler wrote: >I'm running Linux Mint 20.2 (x64 / Cinnamon). > >I'd like to play sound from a device connected to my sound card's >line-in. I'm able to do so by enabling the loopback device in >alsamixer. But even with the line-in level and line-in booster level >set to 0, the volume is too loud. > >Adjusting the line-in volume level in pavucontrol seems to have no >effect. > >Is there a way to reduce the volume level to an acceptable level?
Hi, roughly speaking: As long as the analog input circuit is fed with an appropriate analog audio signal and the digital input domain doesn't exceed 0 dBFS, the signal is "acceptable". Attenuation is only required when mixing (especially non-floating point) digital audio signals, but when doing this, you are anyway using e.g. the digital mixer of a DAW, that allows to adjust the signals. You probably want to adjust the output signal of your audio interface or better, just the level of the speaker's/headphone's analog amplifier. Or else, if the analog output of the device connected to the analog input of your digital audio interface doesn't fit, you might need to convert impedance. IOW I can hardly imagine something that requires to adjust line in levels, apart from some exceptions, for this you will use gear that provides to adjust the analog input levels of your digital audio interface. Let alone that for such a setup, you probably want to remove pulseaudio. Please describe in what way the signal is "too loud". Is the signal distorted? Is the speaker's/headphone's sound too loud? That each and any app has got volume controls nowadays is a silly custom. Only very experienced audio engineers know how to use layers of level controls. When connecting line out with line in typically no "line" level control is needed at all. Regards, Ralf -- “Awards are merely the badges of mediocrity.” ― Charles Ives _______________________________________________ Alsa-user mailing list Alsaemail@example.com https://lists.sourceforge.net/lists/listinfo/alsa-user