Sonic Charge Microtonic User Manual

Page 17

for the left and right output channels. This mode creates a dispersed stereo effect
similar to the sound of a reverb. Furthermore, the noise section features a multi-
mode filter with low-pass, band-pass and high-pass modes as well as an amplitude
envelope with different shapes allowing you to sculpt the noise just the way that fits
your sound.

‣

Noise Filter Mode

Choices: Low-pass, Band-pass, High-pass
Default: Low-pass
The signal from the noise generator passes through a filter featuring three differ-
ent modes:

Low-pass, Band-pass and High-pass. The Low-pass mode cuts

high frequencies from the signal spectrum but leaves the lower frequencies intact,
making the noise softer and duller. This mode is great for adding space and re-
verb to bass drums and such. The

Band-pass mode cuts both low and high fre-

quencies but lets the middle range through, narrowing the sound like when you
play something through a small tube or poor speaker. This mode is a good start-
ing point for many percussion instruments like snare drums, handclaps etc. The
High-pass mode removes the lower frequencies and makes the noise bright and

clear, which is generally what you want for hi-hat and cymbal sounds.

‣

Noise Filter Frequency

Range: 20Hz to 20 000Hz

(20kHz)

Default: 20kHz
This is the cut-off or center frequency of the filter depending on the filter mode.
The cut-off frequency for a

Low and High-pass filter is scientifically defined as

the point on the filter curve where it drops below -3dB in gain.

(Put simply, this is

the point where you start cutting in the signal spectrum.)

For the

Band-pass filter,

the noise filter frequency is the center of the peak in the filter curve, i.e. the point
where most of the signal's spectral power is present.

‣

Noise Filter Q

Range: 0.1 to 10 000.0
Default: 0.70710683
The

Q Value of a filter affects the shape of the filter curve just around the cut-off

frequency. A high q value creates a distinct peak in the filter curve while a low q
value changes the slope of the curve so that it becomes softer and lets more of
the signal through. The q value can also be said to define the width of the band-
pass filter peak; lower q values making it broader and higher making it narrower.
When the noise filter q is turned up to its maximum the noise signal becomes so
narrow that it sound more like an irregular sine tone than noise.

‣

Noise Stereo Mode

Choices: Off, On
Default: Off
The noise generator features a stereo mode where two uncorrelated noise
sources are used for the left and right output channels. This mode creates a dis-
persed stereo effect on the noise, which can be used to simulate reverb effects of
various kinds, or simply to broaden the stereo image of a sound.