The phone's sound
InterDirector Cam sends sound with the picture, kept in step with it. Every sound setting is in Settings › Audio. The Sound drawer, opened with a tap on the meter at the top of the screen, has the same settings but the bitrate, for a quick change with the meter in sight.
The sound is raw: no automatic gain, voice processing or noise suppression from iOS.
Source
- Built-in: the phone’s own microphone.
- USB or Lightning: a microphone or audio interface plugged into the phone, shown by its name once it is plugged in. With none plugged in, the phone’s own is used, and the app says so.
- None: no sound is sent, pictures only. The stream then has no sound track at all.
The source waits until the phone stops sending: whether the stream has a sound track at all is settled at Start. To silence a phone while it sends, use Mute.
Channels and gain
- Channels: for the phone’s own microphone, Mono, or Stereo where the phone records stereo. For a USB or Lightning interface, each input on its own (In 1, In 2 and so on) as mono, or Stereo 1–2.
- Gain: from −12 to +24 dB.
Both change at once, while sending too.
Mute
Mute, in the Sound drawer and in Settings › Audio, sends silence and keeps the sound track, so the phone mutes and unmutes while it sends with no reconnection, and InterDirector’s input keeps its sound strip. Muted, the meter shows a struck-through speaker and Muted. The phone remembers it.
A tap on the meter only opens the drawer; it never mutes by itself, so a stray tap cannot silence a camera.
Sound bitrate
Sound bitrate, in Settings › Audio: 64, 96, 128 (to begin with), 192 or 256 kbit/s. It changes at once, while sending too. Adaptive bitrate lowers only the picture’s bitrate, never the sound’s.
The meter
The meter at the top of the screen shows the sound as it is captured, one bar per channel: green, yellow from −12 dBFS, and orange from −3 dBFS. It reads No sound when there is none, and Muted while muted.
The sound now, at the bottom of Settings › Audio, says what the phone is capturing.
In InterDirector
The phone’s sound arrives as the network input’s own sound. On the input’s Audio tab you can hear it with another input’s sound instead, such as a presenter’s microphone: see Its sound, or another input’s.