input volume cannot be changed

Same here. I have my SM58 running through a Focusrite 2i2. On every other app (GarageBand, FaceTime etc ) Mic works fine. No delay. Levels adjust no prob. System Prefs I select Mic as input and headphones as output.

In Zoom I can test the headphones. Chime tone is fine. Mic test there is a slight delay and I can’t   adjust mic volume. The slider just jumps back.  But at least I can hear mic input. (Though slight delay) Once I leave the settings I can no longer hear mic audio at all, even though I can still see levels on both Zoom audio settings and Focusrite confirming that a signal is coming in to both but the audio input can’t be heard. Zoom is up to date. I hope there’s a solution. This did work before. I’m running a 27 in. iMac late 2013 Mojave all tricked out under the hood.

I have the same problem. I am running a Heil PR40 on a Rodecaster Pro connected USB-C (on Rodecaster Pro) to USB-A on an iMac running OS 12.4 Monterey. Regardless of the sound level recorded on the Rodecaster Pro memory card, my voice heard by Zoom participants is too low. My voice sounds faint and weak. Within the Zoom Audio Settings panel, the Microphone input volume slider is not functional; the adjuster jumps back to the left (lowest setting) upon release by the mouse. Zoom Support, a lot of users are having this problem. What is the solution?

I'm having the exact same issue - using a Mackie ProFX8 Mixer plugged into computer through USB. Zoom won't let me adjust audio input levels and the sound is barely audible on the other end of the call. HELP!! Any solutions?? 

I've been having the same problem as all of you, which was a new problem in the past couple of months. The volume for my high-end microphone on my Focurite is all the way up, yet no one in meetings can hear me. I saw some improvement on the mic test when I checked the box "Automatically adjust microphone volume." However, I don't like Zoom controlling  the volume. I'll see how the next meeting goes. I'm sick of having to switch to my Mac computer's microphone. The quality isn't good enough, and it doesn't sound professional.  Zoom needs to address this problem and allow us to control our volume within their software when we use an interface with a microphone.

Hi there! Chiming in to say I'm in the same boat, and I'm wondering what the solution is. I'e got a Multimix8 Alesis mixer with a  Sampson wireless headset to teach my virtual cycling classes, and suddenly my sound is super low. I thought it might be due to a recent Mac upgrade, but the inability to move the slider is happening on both computers. Did anyone find a workaround? It sees like this problem has been going on for a while -- wondering if there was a resolution but it's not posted? Thank you!

Hi All,

So this issue is because with your interface, your computer gives all control of output volume to your interface. So the only control you have of input and output would be to change the gain on your microphone or change the output volume on your interface. You can get around this by making an "aggregate" input and output. Can use "BlackHole" or I think just make an aggregate too. Hope this helps!

wow it is absolute trash that this is not answered by zoom

Had exactly the same problem. I tried all the abovementioned solutions. Nothing worked, but I finally found the solution! Google Meets - works perfectly. MS Teams will probably work too! The problem is Zoom.

This issue just started for me. I've been using a Shure XLR mic through a MOTU M2 usb interface for a couple years now with no issue, and something changed in the past two days that is making the input volume control in Zoom stuck at zero and unable to move.

I am having the exact same problem. It happened suddenly. I did not do anything to make it happen, or change any settings. The input volume is suddenly set very low and I cannot change it. I have it as "same as system".  So no one in my Zoom calls can hear me properly.