How do I change the sounds or vibrations that my keyboard makes?
To configure your sounds and vibrations go to SwiftKey's settings -> Advanced -> Audio & haptic feedback. You can turn sounds on and off, turn haptic (vibration) feedback on and off, or change the length of the vibration.
You access SwiftKey's settings by longpressing the 123 in the lower left of the on-screen keyboard. Alternatively, you can also tap the SwiftKey icon in your app drawer to access SwiftKey's settings.