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PFL and AFL are acronyms that describe a mixer's SOLO function. PFL stands for "Pre-Fader Listen" and allows the user to "solo" or audition the audio in mono at a point in the signal path before the channel fader. Perfect for a live sound situation where you need to dial in an instrument before bringing it into the mix. AFL stands for "After-Fader Listen" and allows the user to solo the channel at a point in the signal path after the channel fader. This is more commonly used for recording applications (the signal is also typically after the EQ and pan controls). The Main Output signal is not affected by PFL or AFL solo functions, though the Phones and Control Room outputs are. On all Mackie mixers, the solo function serves as the preferred way to set input levels.