# QA402 USB DAC Mirror

**URL:** <https://forum.quantasylum.com/t/qa402-usb-dac-mirror/675>\
**Category:** Uncategorized\
**Created:** [April 23, 2022, 11:42am UTC](https://forum.quantasylum.com/t/qa402-usb-dac-mirror/675 "2022-04-23T11:42:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DamianW](https://avatars.discourse-cdn.com/v4/letter/d/df705f/32.png) [@DamianW](https://forum.quantasylum.com/u/DamianW)\
**Post date:** [April 23, 2022, 11:42am UTC](https://forum.quantasylum.com/t/qa402-usb-dac-mirror/675/1 "2022-04-23T11:42:09Z")

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Hi guys, how do I turn on the Mirror output when testing a USB DAC.

I would like to use both GEN and Expo Chirp for not only the gen 1kHz sine wave but also when looking at frequency response.