User Manual

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6. FILTER FREQ This knob controls the frequency of the Mainframe’s
filter. As the knob is turned up, the frequency increases. The frequencies
cut/passed by the filter vary by the filter type:
HPF: Frequencies above the FREQ knob setting are passed,
frequencies below are cut.
BPF: The FREQ knob controls the center frequency of a pass band.
Frequencies above and below this center frequency are cut.
LPF: Frequencies below the FREQ knob setting are passed,
frequencies above are cut.
Tip: For a tone with no filtering, set the FREQ knob to maximum and set
the toggle switch to LPF.
7. FILTER PEAK This knob controls the resonance of the Mainframe’s
filter. Turning this knob clockwise increases the resonance, producing a
sharper, more cutting tone.
8. EXP / PRESET Button and Green LED This button turns expression
mode or a saved preset on and off. When the Green LED is lit, expression
control is enabled, or the preset is enabled. See pages 6-9 for details on
how to save expression settings or a preset.
9. Footswitch and Red LED Press and release the footswitch to toggle
between bypass and effect modes. When the red LED is lit, the Mainframe
is in effect mode. Double tap the footswitch to enter Sample Rate Tuning
Mode, and tap it once again to exit Sample Rate Tuning Mode and save
the tuned sample rate.
10. INPUT Jack This 1/4" phone jack is the audio input of the
Mainframe. The input impedance is 2M.
11. OUTPUT Jack This 1/4" phone jack is the main audio output of the
Mainframe. The output impedance is 500.
12. EXP Jack Connect an expression pedal or control voltage jack to
allow for external control over every knob on the Mainframe. See pages
6-9 for a description on how to set up and control the Mainframe with an
external expression pedal.
13. 9V Power Jack Plug the output of the Mainframe’s supplied
EHX9.6DC 200mA AC adapter to the 9V power jack located at the top of
the pedal. The Mainframe requires 90mA at 9VDC with a center-negative
plug. Do not exceed 10.5VDC on the power jack.