Audio inputs

An Audio input brings in sound alone, from any Core Audio device (a USB microphone, an audio interface, a loopback device), with no picture. It gets its own card and its own strip in the audio mixer, like any other input.

Add one

Press Add Input…, choose Audio, and pick an Input device from what macOS sees. Each device shows how many input channels it has.

Mono or stereo, and which channels

Choose Channels: Mono, a single channel, or Stereo pair, two channels together. Source channels picks which of the device’s channels to use, useful for an interface with more inputs than you are using at once.

Sample rate

Request preferred sample rate asks the device to run at a rate you set, rather than whatever it is already running at. Leave it off unless you have a reason to change it.

Routing

Like any input with its own strip, it has Gain, Mute, Follow Program, and the ST and bus buttons that route it to Master and the mix buses.

Pairing it with a picture

A camera carries no sound of its own, and a Blackmagic input may not carry the sound you want: either can use an Audio input’s sound instead. See pairing an input’s sound on the Camera inputs page.

Sound from a DAW, or any app with plug-ins

To bring in a track from a DAW, a playback app or anything else that takes VST3 or Audio Unit plug-ins, insert InterStream, our own plug-in, on that track or on a bus. It sends what the track plays over the network, from this Mac or another, and leaves the track itself untouched.

Over NDI, which it sends as soon as it is inserted: a feed named after the track. In InterDirector, add an NDI input, choose that feed, and set Stream to Audio only (see NDI inputs).
Over SRT: add a Network Stream input listening for SRT, and set InterStream to CALLER, with the input’s address and port in HOST and PORT and its Stream ID in STREAM ID. Either codec works: AAC, or uncompressed PCM where the network has room for it. See Network inputs.

Either way it arrives as a source like any other, with its own strip in the mixer, and it can be the sound a camera is paired with.

A show mixed in a DAW, both ways

A sound engineer can mix the whole show in a DAW and send the finished mix to InterDirector with InterStream, as above. What InterDirector plays itself, the sound of a video, a commercial, a jingle or a replay, can go the other way, so that the engineer mixes it with everything else, and only what you choose ever reaches the DAW:

Add a bus for the engineer in Audio Device Setup, To DAW say, set to Enabled: it needs no output device. Route those inputs to that bus alone, with their ST off, so that they are not heard twice (see the audio mixer).
Send the bus over NDI: tick it in the NDI settings and press NDI. It is a source of its own, sound only, named after the bus (see NDI).
In the DAW, insert InterStream on an empty track, set it to receive, and choose that source.

The engineer’s mix comes back as the NDI or SRT input from above. Route it to Master, and leave the bus’s own return to Master off, so that what InterDirector sends reaches the stream once, through the engineer.

The audio mixer, for routing and gain once a source is in.