>>1530757
>my headphones dont have a TRS connector but a TRRS connector
You can plug a TRRS connector into a TRS jack just fine. The extra contact is for the mic and it either gets shorted to ground or left floating.
The Scarlett Solo has 1/4" jacks rather than 3.5mm, so what you really need is a 3.5mm to 1/4" adapter like picrel.