headphones monitoring
There are 3 PFL switches to select the signal you want to monitor in the headphones.
Channel 1&2 have a joint PFL-switch which when activated will route the pre-fade signal to the headphones.
Using the PFL CH1-CH2 select fader you can then choose how much of each channel is sent to the headphones.
Channel 3 has its own PFL switch which will send the signal of that channel to the headphones,
The PFL MIX switch will send the MIX signal to the headphones.