Increasing aux in volume?

[homeby5]

Is there a way to increase the aux in volume? Using my phone to play songs and even when cranked up high, it's not loud. Wondering if there was a setting in the GP10?

[Elantric]

Go to  iphone Music settings will raise headphone output volume

They restrict it to comply with Euro CE laws

https://blog.gitnux.com/guides/how-to-make-headphones-louder-on-iphone/

1. Ensure the Volume Limit is turned off.
A Volume Limit prevents users from increasing the volume beyond a certain point, which could restrict the loudness of your headphones.

To ensure the volume limit is disabled, follow these steps:
1. Open the Settings app on your iPhone.
2. Scroll down and tap 'Music.'
3. Tap 'Volume Limit.'
4. Make sure the 'EU Volume Limit' is toggled off (the switch should be gray). If it's on, toggle it off. Additionally, ensure the volume slider isn't restricting the volume. Drag it all the way to the right to allow maximum volume.