# Advice on using QC as audio interface on iPhone **URL:** \ **Category:** Quad Cortex\ **Tags:** quad-cortex, support\ **Created:** [January 12, 2024, 9:29pm UTC](https://unity.neuraldsp.com/t/advice-on-using-qc-as-audio-interface-on-iphone/13150 "2024-01-12T21:29:50Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![pbraz](https://avatars.discourse-cdn.com/v4/letter/p/edb3f5/32.png) [@pbraz](https://unity.neuraldsp.com/u/pbraz)\ **Post date:** [January 12, 2024, 9:29pm UTC](https://unity.neuraldsp.com/t/advice-on-using-qc-as-audio-interface-on-iphone/13150/1 "2024-01-12T21:29:50Z")
Hi all. I’m looking to learn some best practices about using the quad cortex as an interface straight into my iPhone. I have an iPhone 15 that has a USB-C port, so I am using the USB out into my iPhone. I flipped the USB outputs, so that one and two send the processed signal, So I’m getting the outputs I want but it is very quiet. I don’t really see an option to increase this, but it’s fine in headphones or using XLR out. Is there a better way I should be doing this? Thanks in advance. ---
**Author:** ![LilSenate](https://avatars.discourse-cdn.com/v4/letter/l/a87d85/32.png) [@LilSenate](https://unity.neuraldsp.com/u/LilSenate)\ **Post date:** [January 12, 2024, 10:09pm UTC](https://unity.neuraldsp.com/t/advice-on-using-qc-as-audio-interface-on-iphone/13150/2 "2024-01-12T22:09:04Z")
No idea… but I’ll play around with mine this afternoon! I never even thought of plugging the QC direct into the 15! ---
**Author:** ![pbraz](https://avatars.discourse-cdn.com/v4/letter/p/edb3f5/32.png) [@pbraz](https://unity.neuraldsp.com/u/pbraz)\ **Post date:** [January 13, 2024, 12:16am UTC](https://unity.neuraldsp.com/t/advice-on-using-qc-as-audio-interface-on-iphone/13150/3 "2024-01-13T00:16:02Z")
Yeah, I also find the USB audio weak in the DAW too and usually opt for the XLR connection. Just curious if there’s something to tweak. I even increased the cab output a few DB to try to pull it up.