Change the notification sound in the new Inbox by Gmail I looked for a way to change the default notification sound for new e-mails in Inbox but could not find the setting. In the Gmail app I could change the sound. 

Does anyone know how to change it or if this is just using the default system sound? 

I'm using a Nexus 4.
Looks like it is possible now. From the Help:


Open the Inbox app.
Go to the main menu at the top left.
Scroll down and choose Settings near the bottom.
Select your email address.
Make sure Notifications is checked.
Click 'inbox sound and vibrate'.
Click on "Sound" and choose your preferred notification tone.