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This is the setting that matters most. Get it right and most other things look after themselves. Find Audio input on the front page of the ScreenShepherd window. The ScreenShepherd window, with the Audio input section showing the chosen device and Channel 1 with its level meter and Check button The ScreenShepherd window, with the Audio input section showing the chosen device and Channel 1 with its level meter and Check button
1

Choose your device

Under Device, pick your audio interface from the list. That is the box your microphones are plugged into. The list shows how many channels each one has.
2

Choose the channel the lead singer is on

Under Vocal channel, pick the channel the lead vocal arrives on. The meter beside it moves when someone sings into that microphone.On a big desk, look at the line underneath. It tells you which channels have anything arriving at all, something like Signal on channels 1, 2 and 3, and says when the rest are silent. That turns twenty-four channels into a handful worth trying.
3

Prove it

Press Check. The screen dims and asks you to sing a line of a well known hymn into that channel.Sing it. The words light up as they arrive. When it says That channel carries the voice, the Check button becomes a green tick, and that is how you know you picked the right one.Stop gives up on a channel so you can try another.
It must be the vocal channel, not the main mix. A main mix has the whole band in it and the singing gets lost underneath. This is the single most common thing to get wrong.

More than one singer

If two or three people lead together, press Add another vocal channel for each of them and check each one. ScreenShepherd follows whoever is singing. Three is the most. The button tells you why when it cannot add another, usually because the interface has no spare channels. To change a channel later, use its own picker. To remove one, press the × beside it.

Checking a microphone during a service

Click the meter on the Control Panel. Every vocal channel gets a row, with its own level, so you can see at a glance which microphone has gone quiet. The channel list open above the Control Panel, showing the audio device name and the level on Channel 1 The channel list open above the Control Panel, showing the audio device name and the level on Channel 1

When it stops hearing anything

Can't hear the audio input

Under Audio input it says the input cannot be heard, and the Device box says the interface is not here.Unplugging the interface, or moving it to a different socket, can leave the saved choice pointing at nothing. Pick the interface again from the list. Stopping and starting will not fix it.
Account button in the top right → Settings. Under Microphone access, press Open system settings and allow ScreenShepherd.
The interface is there but silent. Check the cable, the phantom power, and that the desk is actually sending to this output.

When the check will not pass

Try each channel in turn. It is nearly always the wrong channel rather than a broken input. Make sure someone really is singing into that microphone while you check.
Sing the whole line, clearly, into that microphone, then check again.
You are probably on a main mix rather than a vocal channel. Or your second leader’s microphone has not been added yet.
You cannot check while it is listening. Press Stop on the Control Panel first.
The green ticks last for this session only. A tick that outlives the cable it was earned with would be worse than no tick, and checking again costs one line of singing.