Ranges And Scales - Mutable Instruments Shelves User Manual

A. High-shelf section. This section boosts or attenuates all frequencies above the FREQ control. The GAIN
potentiometer controls the amount of attenuation or boosting. No modification is applied when GAIN is in its
central position.
B. Parametric sections 1&2. These two sections boost or attenuate all frequencies in a frequency band
whose central frequency is set by FREQ. The narrowness of this frequency band is set by the Q setting -
from very wide to very selective.
C. Low-shelf section. This section boosts or attenuates all frequencies below the FREQ control. The GAIN
potentiometer controls the amount of attenuation or boosting. No modification is applied when GAIN is in its
central position.
1. 2. Global frequency and gain CV inputs. These CV inputs simultaneously adjust the FREQ or GAIN of
all 4 channels.
3. IN. Audio input. The input signal can optionally be attenuated by -6dB before being processed by the EQ
filter. A jumper is available on the back of the module to enabled/disable this pre-gain.
4. Output clipping indicator. It is recommended to reduce the level of the input signal - or to reduce the
gain on all channels - when this LED lights up.
5. OUT. Audio output.
6. 7. Individual outputs for the parametric sections' filters. Behind the scenes, Shelves' parametric sections
are full-blown multimode filters. The low-pass (LP), band-pass (BP), and high-pass (HP) outputs of these two
filters are provided on these two groups of jacks.
Note: the first batch of modules had these two groups of three outputs on a separate expansion
module. Please refer to this page to learn how to connect it to the main board.

RANGES AND SCALES

On all sections, the FREQ knob spans the entire audio range, from 20 Hz to 20 kHz.
The FREQ CV input has a 1V/Oct scale and acts as an offset to the value set by the FREQ knob.
The GAIN knob covers an attenuation/boost range of -15dB to +15dB.
The GAIN CV input has a 3dB/V scale and acts as an offset to the value set by the GAIN knob.