To get input from a microphone, go to an insert channel and select the input as the appropriate input: Make sure the output is set to Focusrite (in this case we are using Output 1 and 2). Go to the mixer window ('View' > 'Mixer') and click on the master channel. You can change the buffer size from the ASIO Control Panel, which you can open by clicking 'Show ASIO Panel'. You'll also need to set 'Playback tracking' to either 'Hybrid' or 'Mixer'. Open the 'Options' menu, go to 'Audio Settings' and set the device to 'Focusrite USB ASIO'. If it isn't already, right click it and select 'Set as Default Device'. In the 'Playback' and 'Recording' tabs, make sure the Focusrite/Scarlett option is selected as the default device. Once you have installed the driver go to your computer's 'Control Panel' > 'Sound' option. The steps below will guide you through how to set up your Scarlett with FL Studio: