Tuner

Available on which products

• Axe-Fx III: yes
• FM9: yes
• FM3: yes
• Axe-Fx II: yes
• AX8: yes
• FX8: yes

The Axe-Fx III, FM9 and FM3 also feature mini-tuners at several places.

Tuner types

Fractal Audio:

"The strobe tuner and bar tuner use different algorithms. The bar tuner measures the average period of the waveform. The strobe tuner works like, well, a strobe tuner. It "demodulates" the signal with a quadrature oscillator. This effectively measures the fundamental ONLY. The frequency of the fundamental will not necessarily match that of the overall waveform. So it's like having two tuners, a traditional tuner and a strobe tuner running simultaneously and, just as with separate physical tuners, the results may not necessarily be the same. A guitar string is not perfect. The resonances of the overtones aren't always perfect integer multiples of the fundamental. This is exacerbated by the pickups which pull on the strings and cause the overtones to be off (in extreme cases causing the dreaded "stratitis"). Which measurement is correct? That's up to you decide. Some people prefer the sound of the strings being tuned to the frequency of the overall waveform. Others prefer the results of a strobe tuner." [1]

"The needle is a correlation tuner. The strobe tuner downconverts the signal to baseband and then displays the I/Q vectors as a strobe tuner simulation. Zero-crossing tuners are inaccurate. If your strings are old the needle tuner will differ from the strobe tuner because the strobe tuner only displays the fundamental. When your strings get old the harmonics become out-of-tune with the fundamental." [2]

"The needle tuner is not designed to tune that high. It's designed to tune open strings. Use the strobe tuner for intonation." [3]

Select source

Axe-Fx III, FM9, FM3 — Let you choose the input to which the Tuner listens. You can also select all inputs.

Axe-Fx II — Detects signals at the front input of the Axe-Fx II, at Input 1 at the rear and in the SPDIF signal. This cannot be changed. If Input 1 Mode is set to Left Only in the I/O menu, the Tuner picks up the source signal at the rear left input only. If it is set to Sum L+R, the Tuner picks up the source signal at the left and right rear input.

AX8 — Detects signals at the front input.

FX8 — Detects signals at the PRE input. You can change the Global Detector to POST input, which you'll want to do when using the FX8 in a POST-only setup.

Muted tuning

The signal can be muted when the Tuner is engaged. You can choose between muting the input or output. Muting the input allows delay and reverb trails to ring out when engaging the Tuner.

Downtuned guitars

This allows for simplified tuning when tuning down one to four semitones. The Tuner display will read the “natural” name of the note, i.e. if tuning down one semitone an Eb will read E. In addition any blocks that utilize pitch information will also be transposed accordingly.

Display mode

Switch between displaying all flats, all sharps or a mixture of sharps/flats for the displayed note name.

Remote control

Footswitch

Scroll to the Tuner CC (I/O menu) and hit Enter. Click the switch on the footswitch that you want to assign the Tuner to. Or configure it manually by assigning the Tuner MIDI CC to a switch on a MIDI controller. An external switch can also engage the Tuner.

(FM3) "Any button can be assigned to activate the tuner."

MIDI CC

The default MIDI CC for the Tuner is 15 on the Axe-Fx II, AX8 and FX8. Keep it like this to avoid issues.

The Axe-Fx III, FM9 and FM3 let you set the Tuner CC manually in the I/O menu.

MFC-101

The MFC-101 MIDI foot controller has a dedicated Tuner command for the Axe-Fx II, when it's running in Axe-Fx Mode.

You can also program the MFC-101 to turn on the Tuner by pressing a "preset" switch:

1. In Edit > MIDI, set IntCC00 to CC15.
2. In Edit > Preset, scroll to the designated preset and set IntCC01 to On.

3rd-party MIDI controllers

Certain MIDI foot controllers (i.e. Gordius, RJM, Liquid-Foot) can show a graphical tuner display that syncs with the Fractal Audio device. This requires the following:

1. Enable real-time MIDI SysEx communication on the Axe-Fx II (I/O > MIDI) by setting it to “Tuner” or "All".
2. Use a suitable cable connection which allows full bi-directional MIDI communication.

To work with the Axe-Fx III, FM9 or FM3, these controllers must either implement Fractal Audio's proprietary communications protocol for those devices and act as a client, or use real-time MIDI SysEx communication (PDF).

FC controllers

The FC-6 and FC-12 foot controllers provide a dedicated Tuner action and screen.

Display Tuner on heel down

The Axe-Fx III, FM9 and FM3 can be set to automatically display the tuner when an expression pedal is at "heel down" position.

"Added “Tuner on Heel Down” to MIDI/Remote. The corresponding controller will automatically display the tuner when the value is less than 5%. Typically the user would set this to the same CC# (or internal/external pedal) that they use for their primary volume control, whether that is assigned to a global volume control or to a modifier in a Volume block. For example, if you use CC #23 as External Control 1 and connect that to the Volume 1 block in all your presets then set this to 23. Likewise if you use FC 1 Pedal 1 as a global Input 1 Volume control then set this to FC 1 Pedal 1. Now when you set your expression pedal to the heel down position the tuner will automatically display."

Sweetened tunings

Use the offsets below in the Tuner configuration for Peterson GTR Sweetened tuning, from "Do you tune your Guitar in EQU mode or GTR sweetened tuning?:

Note	Cent offset
E1	-2.3
B2	-2.1
G3	-0.4
D4	0
A5	0
E6	-2.3

Troubleshooting

How to tune

"With any tuner the rule of thumb is to use the neck pickup. The "fullest volume" is not necessary." [4]

Intonating

When intonating your guitar and checking the high octave at the 12th fret on open strings, use the strobe tuner feature on the unit.

From Fractal Audio:

"The needle tuner is not designed to tune that high. It's designed to tune open strings. Use the strobe tuner for intonation." [5]

Flickering Axe-Fx II display

"Display flickering on the tuner is normal. Some do it more than other. It's just the nature of the display. The display uses a ping-pong buffer. One page is updated while the other is displayed. Then the pages are switched. Some flickering can occur during the page switch. The reason it is noticeable more on the tuner is that the display is updated more frequently." [6]

Wrong tuner information when sample rate is not 48kHz

If the device is connected to a DAW which is not set to a 48kHz clock (sample rate), the tuner settings may be off.

"The Axe-Fx requires a 48 kHz clock. Anything else will screw up the calculations." [7]

Tuner won't appear or "Waiting for tuner..." message

If the tuner won't appear after pressing the Tuner switch, verify that the Tuner menu is set to display the first tab page.

Also, for 3rd-party MIDI controllers, SEND REALTIME SYSEX must be enabled in the I/O menu, and the MIDI CC (Axe-Fx II, AX8, FX8) must be set to default.