# MOTOR MIXER for PX odd models config **URL:** \ **Category:** PX4 Autopilot\ **Created:** [October 21, 2016, 9:55pm UTC](https://discuss.px4.io/t/motor-mixer-for-px-odd-models-config/1537 "2016-10-21T21:55:51Z")\ **Posts on this page:** 1\ **Showing post:** 8
**Author:** ![RicardoM17](https://discuss.px4.io/user_avatar/discuss.px4.io/ricardom17/32/4040_2.png) [@RicardoM17](https://discuss.px4.io/u/RicardoM17)\ **Post date:** [September 9, 2019, 9:09am UTC](https://discuss.px4.io/t/motor-mixer-for-px-odd-models-config/1537/8 "2019-09-09T09:09:02Z")
@mehrdad_mansouri Here are some good links: [https://dev.px4.io/v1.9.0/en/concept/mixing.html](https://dev.px4.io/v1.9.0/en/concept/mixing.html) [https://dev.px4.io/v1.9.0/en/airframes/adding\_a\_new\_frame.html](https://dev.px4.io/v1.9.0/en/airframes/adding_a_new_frame.html) > [@How to add X and Y control in custom airframe/mixer](https://discuss.px4.io/t/how-to-add-x-and-y-control-in-custom-airframe-mixer/6615/13): > > Hi Riccardo, well done on setting up your custom mixer. I still don’t understand how to implement a custom mixer for a multicopter following the guidance on the px4 website. Could you please point me to an example of a mixer (preferably one with a servo) which I can use as a working example? Thank you. EDIT: So after a nice long chat with @RicardoM17, I have some idea of how mixing works. This is to confirm that I understood correctly and for any one in the future who stumbles on this post lik… > [@Custom mixer not working](https://discuss.px4.io/t/custom-mixer-not-working/6005/17): > > IIRC there are only 8 main outputs so you’d have to transfer at least one to the aux output. In my thesis I developed a tilt-quadrotor (4motors + 4 servos) and I used the motors on the MAIN and the servos on the AUX. In your case I’d move the servo to the aux and maybe the ruddervators aswell. Hopefully with them you will be able to understand how a mixer works 🙂 --- _[View the full topic](https://discuss.px4.io/t/motor-mixer-for-px-odd-models-config/1537)._