Alesis S4 Plus Bedienungsanleitung PDF herunterladen (Seite 58)

Editing Programs: Chapter 6

S4 Plus Reference Manual 57

Filter

Filter (Page 1)

Frequency (00 to 99)

This sets the filter's initial cutoff frequency. Lower values give a duller sound since

this removes more harmonics; higher values let through more harmonics, which gives

a brighter sound.

Tip:

Signals with complex harmonic structures are most affected by the filter.

Examples:

A sine wave has virtually no harmonics so you will not hear any significant

changes as long as the filter cutoff is higher than the note pitch. If the filter cutoff is

lower than the note pitch, you will either not hear the note, or it will be very soft. A

harmonically-rich sample (such as brass or white noise) will be greatly affected by the

filter.

If the Filter Frequency is set to maximum, in most cases all other variables in the

Filter function will have no effect. Most other filter functions raise the filter frequency,

and it can't be greater than 99. So if you want to use filter effects, proper setting of

this initial cutoff frequency is crucial. This is the "baseline" from which all other filter

parameters will raise or lower (open or close) the filter.

If the Filter Frequency is set to 00, and no other parameters are set to raise it

dynamically, no sound will pass through the filter at all--there will be silence. If the

Amp settings are wide open and you can't hear anything, check the Filter Frequency

setting.

Since the waveforms in ROM are recorded at the brightest possible setting, in many

cases dynamic filtering is crucial to making a program sound natural.

Keyboard Track (On or Off)

When off, the filter cutoff remains constant across the keyboard. Higher notes will be

more affected than lower notes, since the filter cutoff is comparatively lower for higher

notes than lower ones.

When on, the filter frequency tracks the keyboard pitch. Therefore, if using the filter

creates a particular harmonic structure when you play one key, playing a different key

will shift the filter frequency to maintain the same harmonic structure.

Velocity (-99 to +99)

At +00, velocity has no effect on the filter cutoff. With positive values, playing harder

increases the filter cutoff. More positive values drive the cutoff frequency higher for a

given amount of velocity. More negative values drive the cutoff frequency lower for a

given amount of velocity.

Tip:

Many acoustic instruments, such as acoustic guitars, sound brighter when you

play them more forcefully. Adding a little positive velocity control over the filter can

simulate more realistic acoustic sounds.

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