# How to setup an external wah to the QC?

**URL:** <https://unity.neuraldsp.com/t/how-to-setup-an-external-wah-to-the-qc/14070>\
**Category:** Quad Cortex\
**Created:** [May 8, 2024, 3:37am UTC](https://unity.neuraldsp.com/t/how-to-setup-an-external-wah-to-the-qc/14070 "2024-05-08T03:37:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gate2sandesh](https://avatars.discourse-cdn.com/v4/letter/g/ad7895/32.png) [@gate2sandesh](https://unity.neuraldsp.com/u/gate2sandesh)\
**Post date:** [May 8, 2024, 3:37am UTC](https://unity.neuraldsp.com/t/how-to-setup-an-external-wah-to-the-qc/14070/1 "2024-05-08T03:37:43Z")

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I have the Dunlop Cry Baby 535Q which has two ports (Amplifier and Instrument).  
Which one goes to which port in QC unit? Can I use this as an expression pedal?

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**Author:** ![aoloso](https://avatars.discourse-cdn.com/v4/letter/a/dec6dc/32.png) [@aoloso](https://unity.neuraldsp.com/u/aoloso)\
**Post date:** [May 8, 2024, 8:31am UTC](https://unity.neuraldsp.com/t/how-to-setup-an-external-wah-to-the-qc/14070/2 "2024-05-08T08:31:36Z")

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You can’t use it as an expression Pedal. You connect the amplifier out to the QC Input 1 or 2. And your guitar goes into the “instrument” input