(See PG 5 in owners manual)
A: PFL, AFL & SIP are acronyms that describe a mixer's SOLO function. PFL stands for "Pre-Fade 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. SIP stands for "solo in place" and is also known as stereo AFL (After-Fade Listen). Solo in place is more commonly used for recording applications and taps the audio signal after the channel fader, EQ and pan controls. The main output signal is not affected by PFL and SIP. On all Mackie mixers, the solo function serves as the preferred way to set input levels.