Boss GT-PRO Owner's Manual page 102

Chapter 10 Other Features
Parameter/
Explanation
Range
TUNER Pitch
fig.10-0500d
435–445 Hz Sets the reference pitch.
The frequency of A4 (the middle A on a piano keyboard) played by
an instrument (such as a piano) that provides the pitch to which the
other instruments refer in tuning before a performance begins is
called the reference pitch.
* This is set to 440 Hz when shipped from the factory.
TUNER Out
fig.10-0510d
Mute, Bypass, Current Selects the output while Tuner is on.
Mute
Sounds are muted, and no sound is output.
Bypass
Sounds input to the GT-PRO bypass the processing and are output
directly as is.
When the tuner is switched on while set to "Bypass," you can adjust
the volume of the direct sound by moving the EXP pedal (EXP pedal
connected to the EXP PEDAL 1 jack or the FC-200's EXP pedal (MIDI
CC#7).
* The bypass sound is output in mono.
Current
Allows tuning with the sound of the currently selected patch.
* This option may not function properly if you are using Harmonist,
Auto Riff, or other effects that rely on pitch detection.
Switching Tuner On and Off by Lifting Up
on the EXP Pedal
When the EXP pedal is functioning as a Foot Volume
control, set one of the ASSIGN 1–12 Assign settings (p.
66) to one of the following settings.
With this setting, you can switch on Tuner by drawing
back the EXP pedal.
Target: TUNER On/Off
Target Min: On
Target Max: Off
Source: EXP PEDAL 1
* You can achieve the same effect using the FC-200's EXP
pedal when FC-200 EXP is selected as the Source setting.
102
Mode: Normal
Act. Range Lo: 0
Act. Range Hi: 1–127