If you don’t see the Sound Levels window on the screen, click the button in the top-right corner of the Main Window to show it.

The Sound Levels Window shows what audio source is in use. Clicking on the name of the source will show you any other available sources. The Microphone menu at the top of your display also provides options, including the Mute Microphone tool—shift⌘M.

A meter in the Sound Levels Window will show the currently selected source’s volume level. You can adjust this with the slider. When a Skype call is in progress, you can also adjust its levels with the Sound Levels window. When sharing your screen, you’ll also see a sound level adjustment for System Audio.

Each audio channel (microphone, movie audio, Skype, and System Audio) can be muted using the Sound Level window’s MUTE buttons. These mute setting will be saved in the Scene. For example, you may have a Skype guest online, but only unmute the Skype guest’s audio in particular Scenes.

Adding a Second Audio Input

If Ecamm Live detects a second audio input, for example a second USB microphone, you’ll see a + button show up in the Sound Levels window. Click this to add a second audio input.

To remove the secondary audio input, click the - button.

When an iOS device is connected, Ecamm Live will automatically add it as a second audio device. You will also see a checkbox and popup menu to configure audio play-through for the iOS device. This will allow you to hear sound from the iOS device on your Mac’s speakers or a headset.

Mapping Audio Channels for Stereo

Ecamm Live will automatically broadcast System Audio and movie playback audio in stereo. Audio from a connected microphone or mixer works a bit differently.

By default, Ecamm Live will mix all of an input device’s channels together. However, if you are using a stereo audio input, you may wish to map channels 1 and 2 to left and right stereo. Do this using the Map Input Channels 1 And 2 To Left And Right Stereo checkbox in Ecamm Live’s Audio Preferences.

Note that when Echo Cancellation is enabled, Ecamm Live will only use audio on channel 1 of multi-channel audio input devices, so stereo audio will not be available.

Echo Cancellation

If you are using your Mac’s speakers during your broadcast, that may cause an echo if your mic picks up speaker audio. To prevent this, Ecamm Live has Echo Cancellation, which you can enable or disable in the Sound Levels window, or Options menu ➝ Echo Cancellation. Echo Cancellation listens for sounds produced by your speakers and removes it from your broadcast. It works remarkably well, most of the time. If your audience is reporting missing sound, try turning off this feature. If you are using headphones, echo cancellation is disabled automatically.

When Echo Cancellation is enabled, Ecamm Live will only use audio on channel 1 of multi-channel audio input devices. If your audio interface has more than one channel, be sure to turn off Echo Cancellation.

An Aside on Audio Quality

An old adage about video production is “Viewers will tolerate mediocre video quality if the audio is good, but poor audio is never tolerated.”

Your goal is as much green visible in the audio monitor as possible when you’re speaking, little yellow, and avoid the red. If you’re hitting red regularly, your audio is turned up too high. The sound will distort when you broadcast. Move the slider to the left until you rarely, if ever see red. Go too far left, and your audience will have trouble hearing you.

While Ecamm Live works great with the Mac’s internal microphones, we recommend the use of a quality USB microphone whenever possible.

Next article: Virtual Webcam

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