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# Combine Output from Multiple Channels

The following schema describes how to use the `mixer` module to combine word output from multiple modules into a single timeline.

    [StereoWavToText2]
    0 = l,r ← wav1(STEREO, Input)
    1 = f1 ← frontend(_, a:l)
    2 = nf1 ← normalizer(_, f1)
    3 = w1 ← stt(_, nf1)
    4 = f2 ← frontend1(_, a:r)
    5 = nf2 ← normalizer1(_, f2)
    6 = w2 ← stt1(_, nf2)
    7 = w3 ← mixer(_, wa:w1, wb:w2)
    8 = output ← wout(_, w3)

`0` | The `wav` module processes the input stereo audio file as left and right audio data.
`1` | The `frontend` module converts the left audio channel (`l`) into speech front-end frame data. In this step, the variable form `a:l` represents the change of name for the left channel audio data (type `l`) to audio data (type `a`).
`2` | The `normalizer` module normalizes the frame data from `1` (`f1`).
`3` | The `stt` module converts the normalized frame data from `2` (`nf1`) into text.
`4` | The `frontend` module converts the right audio channel (`r`) into speech front-end frame data. In this step, the variable form `a:r` represents the change of name for the right channel audio data (type `r`) to audio data (type `a`).
`5` | The `normalizer` module normalizes the frame data from `5` (`f2`).
`6` | The `stt1` module converts the normalized frame data from `6` (`nf2`) into text.
`7` | The `mixer` module combines the recognized words resulting from 3 (`w1`) and from 6 (`w2`) into a single word output timeline (`w3`).
`8` | The `wout` module writes the recognized words resulting from `7` (`w3`) to the output file.

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