Select a audio interface driver and optimize the settings
The term 'soundcard' is used rather loosely, you may have a soundcard in your PC, a chip on your motherboard or it may be an external device connected by USB/FireWire/Bluetooth, etc. The audio interface is the device that makes the sound you hear from your PC speakers. The audio interface driver is the software interface between the Windows operating system and the audio interface. The driver tells Windows, and so FL Studio, what inputs, outputs and what sample rates the audio interface can support. Two drivers mentioned frequently in this manual are 'Primary Sound Driver' (the Windows default) and ASIO4ALL (a generic ASIO driver that runs most audio interfaces).
Introduction: Watch this video tutorial on the ASIO4ALL driver setup.
An ASIO driver: If you have a audio interface with a custom supplied ASIO driver then use that, if not, we recommended you use ASIO4ALL. If you don't see ASIO4ALL in the list download it from www.asio4all.com. ASIO drivers give better performance and are a pre-requisite for audio recording.
Direct Sound: If ASIO4ALL does not work then select the Windows 'Primary Sound Driver' as shown below.
Your 'Output' options may be different, they depend on your brand of audio interface and installed drivers. Not all cards have ASIO driver options.