We've also created a guide to help you upgrade from version 1 to version 2.
On June 17, 2014, we will temporarily replace version 1 with version 2 between 10:00 and 11:00 UTC. We will do this again on June 24, 2014, between 18:00 and 19:00 UTC. These two upgrade tests will give you an opportunity to understand the impact of this change on your applications. To ensure a seamless transition for your users, we strongly encourage you to upgrade and perform internal tests in advance of these dates.
To receive notices before, during, and after these tests, follow @SoundCloudDev on Twitter.
If you have any questions about this upgrade, please feel free to email firstname.lastname@example.org.