JoinAudioChannels - ComfyUI Built-in Node Documentation

Complete documentation for the JoinAudioChannels node in ComfyUI. Learn its inputs, outputs, parameters and usage.

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The Join Audio Channels node combines two separate mono audio inputs into a single stereo audio output. It takes a left channel and a right channel, ensures they have compatible sample rates and lengths, and merges them into a two-channel audio waveform.

Inputs

Parameter	Data Type	Required	Range	Description
audio_left	AUDIO	Yes		The mono audio data to be used as the left channel in the resulting stereo audio.
audio_right	AUDIO	Yes		The mono audio data to be used as the right channel in the resulting stereo audio.

Note: Both input audio streams must be mono (single-channel). If they have different sample rates, the channel with the lower rate will be automatically resampled to match the higher rate. If the audio streams have different lengths, they will be trimmed to the length of the shorter one.

Outputs

Output Name	Data Type	Description
audio	AUDIO	The resulting stereo audio, containing the joined left and right channels.