Re: [pulseaudio-discuss] Need help resolving audio recording/playback issues
On Wed, Feb 16, 2022 at 10:57:18AM -0800, Rich Shepard wrote: > On Wed, 16 Feb 2022, Sean Greenslade wrote: > > > - The preamp gain knob on the Scarlett is set high enough. Dynamic mics > > can have pretty weak signals. On mine, I need to pretty much max out the > > preamp to get signals strong enough to light up the green ring. > > Sean, > > I turned the Scarlett Solo mic gain to maximum and the pre-amp green ring > flickers when I speak. So this part's resolved; I must have turned down the > gain without noticing. Great, so now we know the signal is getting in to the audio interface. > With audio-recorder started pavucontrol shows it present in the Recording > tab, but the VU bar doesn't move when I speak into the microphone. This is pretty strange. If you look on the Input Devices tab, do you see the Scarlett device and its VU meter? Even with no application recording, the Input Devices tab VU meter should be reacting to the input. Can you run the command "pactl list sources" and post its output? Also, can you check the Configuration tab of pavucontrol and see what profile the Scarlett is set to? --Sean
Re: [pulseaudio-discuss] Need help resolving audio recording/playback issues
On Wed, 16 Feb 2022, Sean Greenslade wrote: - The preamp gain knob on the Scarlett is set high enough. Dynamic mics can have pretty weak signals. On mine, I need to pretty much max out the preamp to get signals strong enough to light up the green ring. Sean, I turned the Scarlett Solo mic gain to maximum and the pre-amp green ring flickers when I speak. So this part's resolved; I must have turned down the gain without noticing. With audio-recorder started pavucontrol shows it present in the Recording tab, but the VU bar doesn't move when I speak into the microphone. Accepting that pulse audio is not the issue and that what I don't know about audio on linux would fill Wikipedia, could you suggest where I look to find why audio-recorder saves an 86 Kb .mp3 file but pavucontrol doesn't show my voice being recorded since nothing comes from the speakers when mplayer processes that file? Is it hardware? Software? Configuration? A missing component? I've no idea where to start diagnosing the problem. Thanks again, Rich
Re: [pulseaudio-discuss] Need help resolving audio recording/playback issues
On Wed, 16 Feb 2022, Sean Greenslade wrote: On the Scarlett USB interfaces, the green/red LED ring around the input gain knob is driven directly by the hardware. Pulseaudio has no influence over this. So if you're not seeing any signal there, the issue is in hardware. Make sure: - The XLR cable is OK and fully seated into the plugs on both ends. - The switch on the side of the mic is on. It needs to be on to feed output to the XLR jack. - The preamp gain knob on the Scarlett is set high enough. Dynamic mics can have pretty weak signals. On mine, I need to pretty much max out the preamp to get signals strong enough to light up the green ring. Sean, Thanks very much. I probably had the gain too low. Stay well, Rich
Re: [pulseaudio-discuss] Need help resolving audio recording/playback issues
On Tue, Feb 08, 2022 at 01:21:24PM -0800, Rich Shepard wrote: > Something(s) changed here and I don't know enough about linux audio to fix > the problems. > > Environment: Slackware64-14.2. Audio-Technica AT2005USB, Scarlett Solo Gen > 3. The latter two are connected by an XLR cable. > > All worked fine until a few days ago. Now pavucontrol Configuration tab sees > the Scarlett Solo USB connected to the desktop, and the Input Devices tab > shows three options: Front Microphone (unplugged, although that's where the > Scarlett Solo is connected), Rear Microphone (plugged in, and the only one > to show the vu bar responding to noise as well as flickering when there's no > microphone connected or turned on), and Line In (unplugged). > > Earlier today, using audio-recorder (version 2.2.3) and connecting the > Audio-Technica AT2005USB with the USB cable I successfully made a test voice > recording that mplayer sent to the Creative Pebble speakers. I could not > repeat this later in the morning. While audio-recorder wrote a 327K file, > aplay, mplayer, and vlc don't produce what I recorded in the .mp3 file. > > Using a new Cable Masters XLR cable I'm still not seeing the Scarlett Solo > input LED ring flicker when I speak. The AT2005 microphone does work ... at > least it did earlier today with the USB cable. On the Scarlett USB interfaces, the green/red LED ring around the input gain knob is driven directly by the hardware. Pulseaudio has no influence over this. So if you're not seeing any signal there, the issue is in hardware. Make sure: - The XLR cable is OK and fully seated into the plugs on both ends. - The switch on the side of the mic is on. It needs to be on to feed output to the XLR jack. - The preamp gain knob on the Scarlett is set high enough. Dynamic mics can have pretty weak signals. On mine, I need to pretty much max out the preamp to get signals strong enough to light up the green ring. --Sean
