Zoom GFX-1 Operation Manual page 11

To adjust the master volume
Press one of the VALUE [+]/[-] keys
to change the value.
The setting range is 0 - 50. When the unit is turned off
and on again, the setting will be reset to 40.
When using headphones, the master volume setting
HINT
can be used to adjust the listening volume.
Switch banks
To select among the banks A - J, use the BANK
[W]/[Q] keys.
By pressing foot switches [1] and [2] together, you can
HINT
switch to the previous bank, and by pressing foot switches
[3] and [4] together, you can switch to the next bank.
Selecting Patches for Play
ZOOM GFX-1 11