How do I swap between the Crescendo 2 Bendable Vibrator and Tenuto on the app?

To change between Crescendo and Tenuto on the app, swipe down to the vibes menu and then click the gear wheel at the top right corner. Scroll down in the settings menu and you will see 'Swap device'. Here you can change between Crescendo and Tenuto. Click 'Save' and then 'Done' and you will be able to connect to the new device you have chosen. Here is a quick video demonstrating this.