This will copy the active channel into the silent stereo channel so audio comes from both speakers. Select your input from the lower, mono INPUT list. Solution: The Mixer INPUT menu has an upper stereo list and lower mono list. You are probably feeding your audio-interface a signal that only appears on the left or right channel of a stereo input.
Associate a Playlist lane with a Mixer track by Right-clicking the Playlist track header and selecting - Track mode > Audio track > Insert (link to the desired Mixer Track).
#Fl studio asio driver
NOTE: On Windows, Input options will only be available if an ASIO audio device driver is being used and macOS you may also need to Aggregate your Audio Devices. Click the icon in front of the Input menu to choose Pre vs Post effects recording. If you have more than one audio input to record, use multiple mixer tracks to receive each input. The screenshot above shows the audio device microphone (Mic 1) selected on Mixer Track 4. The Input menu displays a drop-down list from your selected audio device/s (mic, line, etc). Each Mixer track can receive one external stereo audio input.