Purpose

Mix4 Audio sums up to four audio sources into one stereo output, with independent gain on each input and a master level. It is the basic summing node for combining instruments, effect returns, and live sources into a single bus.

TouchDesigner Use

Wire your sources into the inputs, set each input gain to balance them, and use Master for the overall bus level. Wire out toward an effect chain, a recorder, or Device Out. The first two inputs are the main signals; the second two are there when you need to fold in extra sources.

Inputs And Outputs

• Input 0: in1 audio. Required.
• Input 1: in2 audio. Required.
• Input 2: in3 audio. Optional.
• Input 3: in4 audio. Optional.
• Output 0: out emits the summed mix. The output shape follows in1.

All inputs accept mono or stereo PCM. Mono sources are spread across the output channels.

Main Controls

• Gain1 to Gain4: per-input level. An input with no connection is skipped.
• Master: overall output level applied after summing.
• Normalize: how the summed signal is contained.
  • none: straight sum, no limiting.
  • softclip: clamps peaks so the mix cannot exceed full scale.
  • average: divides the master level by the number of connected inputs, keeping loudness steadier as you add sources.

Notes

• Gains and master move smoothly when changed, so level edits do not click.
• Use softclip when summing hot sources that would otherwise overshoot. Use average when you want adding sources to keep a consistent overall level.
• The output channel layout matches in1, so wire your reference source there.

Parameters

This operator does not expose user parameters in the extracted schema.

Catalog metadata

Roles

• transform
• mixer

Tags

None listed.

Search groups

• audio