How do I turn off the sound for push notifications?

How do I turn off the sound for push notifications?

For Android users 

Please go to your phone settings - notification settings - Advanced Notification Settings - Castbox - tap "Castbox Push" - Importance - select "Medium" or "Low" (Eg: Samsung Galaxy S7 edge). Please check the screenshots below and see if you have similar settings on your phone.

For iOS users

Please go to phone settings - notification - find Castbox - toggle "Sounds" off.