76
12 SETUP MENU
PARAMETER
Description
Output 3 Boost/Pad
Output 4 Boost/Pad
0/6/12/18 dB
These settings engage a boost/pad which can help lower the noise floor of
Output 3 or 4. This may be useful when outputting to a tube amp or modeler or
with the Four-Cable Method.
Boost/Pad helps optimize D/A performance without affecting levels, since a
boost at the converter’s input is paired with a corresponding cut at its output.
Be watchful, however, as boosting makes it easier to clip the converters.
Watch the meters and if clipping occurs, reduce levels within your preset or
turn this setting down.
I/O: USB/AES PAGE
The USB/AES page of the I/O menu contains parameters to adjust the levels of USB and AES inputs.
USB 1/2, 3/4, 5/6, 7/8 – These parameters adjust USB Input levels from -40 to +20 dB. Remember that from the
perspective of the Axe-Fx, a “USB Input” is used for computer playback; audio is routed from the computer to a
USB input of the Axe-Fx, and levels can be cut or boosted here. Be careful not to boost overall levels to the point
of output clipping.
AES/SPDIF – This scales the levels of signals from the AES and SPDIF inputs. Recognize that this scaling occurs
at the output of the input; that is, after the input itself but prior to any processing on the grid.
I/O: PEDAL PAGE
The Pedal page of the I/O menu contains parameters to set up and use an expression pedal or a switch through
the Pedal jacks on the rear panel of the Axe-Fx III. Expression pedals should have a linear resistance taper and
max resistance of 10kΩ to 100kΩ. The Fractal Audio Systems EV-1 and EV-2 expression pedals are recommended.
Expression pedals must be used with Tip-Ring-Sleeve (TRS) cables.
An external switch may also be used, as long as its contacts make and break the connection between tip and
sleeve. A regular 1/4" guitar cable can be used with switches.
Two meters show the readings for connected pedals both pre and post calibration. It is acceptable for the PRE-
CAL meter to not reach its full limit, but if the POST-CAL meter doesn't reach the top or bottom of its range, please
perform calibration again.
