How do I fix my ASIO4ALL no sound?
Right-Click the Speaker icon (volume control) on the Windows task bar (lower right) and click Playback devices. Then right-click and disable and then do the same again to re-enable your device. Open FL Studio and see if the audio now works.
How do you change the output on ASIO4ALL?
The ASIO4ALL window will pop up. On the left-hand side, click on the "+" to the left of your audio interface, then enable the inputs and outputs by clicking on the "power button" next to them. On that screen you can adjust the audio buffer size using the sliding bar at the bottom of the window.