This feature allows you to receive audio over an HDMI cable and transmit it to the browser in WebRTC mode.
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!!! warning
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* This is only supported by PiKVM V3 devices right now. This may or may not work on other CSI devices as most have a hw defect.
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* This is only supported by PiKVM V3+ devices right now. This may or may not work on other CSI devices as most have a hw defect.
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* Please note the feature is experimental. Nothing will explode for you, but something may not work. Please report about problems [here](https://discord.gg/bpmXfz5) (preferred) or [here](https://github.com/pikvm/pikvm/issues/97).
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* KVM switches may or may not work, we currently do not have a list of what works due to the feature being new/experimental.
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* MIC support is not supported at this time, it may be supported in the future.
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!!! info
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PiKVM V4 has enabled this feature by default.
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## Preparing
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1. Make sure that you have not removed the [jumpers related to audio (4)](v3.md#atx-connection) on the V3 board and have not deleted or commented out the `dtoverlay=tc358743-audio` line in `/boot/config.txt`. Return everything as it was, if you changed it.
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1. Make sure that you have not removed the [jumpers related to audio (4)](v3.md#atx-connection) on the V3 board and have not deleted or commented out the `dtoverlay=tc358743-audio` line in `/boot/config.txt`. Return everything as it was, if you changed it.ForV4youcanskipthisstep.