The poncho is designed to be weather resistant to protect your phone from rain, just dirt, sweat etc, so unfortunately it was not designed to be used with cable headphones or charging cables connected.
We recommend using wireless headphones if you need audio while using the poncho.
So of our customers have punched holes in the ponchos so they can use their headphones/charging cables while the poncho is fitted. While we don't recommend doing this as it compromises the poncho ability to protect your phone from the elements, it is an option. Please note that doing so will void the warranty.