Electro-Harmonix MAINFRAME bit crusher Manual page 10

S
ECONDARY
The Mainframe allows you to take even more control over the bit crushing
effects by accessing "hidden" parameters through Secondary Knob Mode.
Use the secondary knob functions to fine tune the exact tone you want
from the Mainframe.
USING SECONDARY KNOB MODE
1. Press and hold the footswitch. While holding the footswitch, press the
EXP/PRESET button. The Red LED will blink to indicate that you are in
Secondary Knob Mode.
2. Turn the PEAK, FREQ, BIT DEPTH, and SAMPLE RATE knobs to edit
the secondary knob parameters. The VOL and BLEND knobs work
normally in Secondary Knob Mode.
3. To exit Secondary Knob Mode, press and release the footswitch or the
EXP/PRESET button. The Red LED will stop blinking. The secondary
knob parameters are saved and will be maintained even if the
Mainframe is power cycled.
Note: The normal knob parameters set by the PEAK, FREQ, BIT DEPTH,
and SAMPLE RATE knobs before entering Secondary Knob Mode are
preserved until those knobs are moved again.
SECONDARY KNOB PARAMETERS
SAMPLE RATE Knob:
When set below 50% (factory default), the Mainframe's sample rate
reduction can be adjusted continuously through its range.
When set above 50%, the sample rate is constrained to musical
pitches, and is adjusted one half-step at a time.
BIT DEPTH Knob:
When set below 50% (factory default), the Mainframe's bit crushing
follows the instrument's amplitude envelope. In this setting, loud and
soft signals will have the same number of bits.
When set above 50%, the Mainframe's bit depths have fixed levels,
so quiet signals have fewer bits, and are therefore more distorted.
This also results in a gating effect at higher settings.
FILTER FREQ Knob:
When set below 50% (factory default), the filter will be 2nd-order.
When set above 50%, the filter will be 4th-order. This setting applies
to all filter directions (LPF, BPF, HPF). The 4th-order filter more
strongly blocks any frequencies that are being cut by the filter.
K F
NOB UNCTIONALITY
Toggle continuous/pitched sample rates
Toggle envelope-following/fixed bit crushing
Toggle 2nd-order/4th-order filter
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