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# [mixer] Module Configuration

The `mixer` module combines word outputs from multiple modules into a single timeline that has a maximum of one word for each time position. For example, you can use this module to combine the results for each channel in a stereo speech-to-text task, if you do not require separate results for each channel.

You can combine the output from up to five channels (`wa`, `wb`, `wc`, `wd` and `we`). If multiple inputs contain a word other than silence in a particular time position, the word in `wa` takes precedence over the word in `wb`, `wb` takes precedence over `wc`, and so on. Each input word appears a maximum of once in the output.

The labels `<s>` and `<SIL>` represent silence, and therefore have no precedence in any channel.

For example, if the input for `wb` is:

    0.000 1.000 Hello 0.000

and input `wa` is:

    0.000 0.500 <s> 0.000
    0.500 0.100 This 0.000
    0.600 0.400 <SIL> 0.000

The combined output is:

    0.000 0.500 Hello 0.000
    0.500 0.100 This 0.000
    0.600 0.400 <SIL> 0.000

## Input and Output

Mode | Input | Output | Description
--- | --- | --- | ---
| `wa`,`wb`,`wc`,`wd` |  | Combines the word label streams `wa`, `wb`, `wc` and `wd` into a single word label stream.

Examples:

    w5 <- mixer (_, wa:w1, wb:w2)

    w5 <- mixer (_, wa:w1, wb:w2, wc:w3, wd:w4)

## Parameters

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