Zoom F8n Pro 8-Input / 10-Track Multitrack Field Recorder - Manual (Page 249)

5.
Use to select the FRC-8 fader and knob operation, and press .
Setting Explanation
Absolute When a knob or fader is operated, the parameter value will change to
the value shown by that knob or fader.
Safety When a knob or fader is operated, the parameter value will not
change until the knob or fader first matches that value.
NOTE :
The FRC-8 headphone volume operation cannot be changed.
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