Roland XP-80 Owner's Manual download pdf (Page 52)

Modifying the brightness of sound with a

filter (TVF)

TVF Param (TVF parameter) display

This display is for TVF (Time Variant Filter) settings. By

changing a sound’s brightness or thickness, a Tone can be

modified. Frequency characteristics of the filter are dis-

played graphically at screen lower left.

Filter Type

Selects the filter type. A filter attenuates a specific frequency

range to modify the brightness or thickness of sound.

OFF

: No filter is used.

LPF

: Low Pass Filter cuts frequencies above the cutoff fre-

quency to round off the sound. This is the most common fil-

ter used in synthesizers.

BPF

: Band Pass Filter cuts frequencies below and above the

cutoff frequency range. Most effective for creating sounds

with strong characteristics.

HPF

: High Pass Filter cuts the frequencies below the cutoff

frequency. Suitable for creating percussive sounds empha-

sizing highs.

PKG

: Peaking Filter emphasizes frequencies around the cut-

off frequency. You can use this to create wah-wah effects by

employing an LFO to change the cutoff frequency cyclically

(p.58).

Cutoff Frequency

Sets the frequency at which the filter begins to have effect on

the waveform’s frequency components.

With LPF selected for the Filter Type parameter, lower

Cutoff Frequency settings will reduce upper harmonics for a

more rounded sound. Higher settings will make sound

brighter.

If BPF is selected, harmonic components will change

depending on the Cutoff Frequency setting. Using this para-

meter effectively will create some highly distinctive sounds.

With HPF selected, higher Cutoff Frequency settings will

reduce lower harmonics to emphasize just the brighter com-

ponents of the sound.

With PKG selected, the harmonics to be emphasized will

vary depending on Cutoff Frequency setting.

Resonance

Emphasizes frequencies around the cutoff frequency.

Excessive level at some settings can cause oscillation and

distortion.

Resonance Vel Sens (Resonance velocity sensitivity)

Use this parameter if you want velocity to influence the

Resonance parameter. If you want higher keyboard veloci-

ties to create more changes in Resonance, use positive (+)

values. For less Resonance change, use negative (-) values.

Cutoff Keyfollow (Cutoff frequency keyfollow)

Use this parameter if you want the cutoff frequency to be

influenced by the key pressed. Higher settings will increase

change relative to middle C (C4). Positive (+) settings will

make cutoff frequency rise as you play higher on the key-

board. Negative (-) settings will lower the cutoff frequency.

This setting is graphically displayed at screen lower right.

TVF Envelope display

This display is used for setting TVF envelope (how cutoff

frequency changes over time). The TVF envelope is dis-

played graphically.

Time1-4 (TVF envelope time 1–4)

Sets TVF envelope time (Time 1–4). Higher settings will

extend the time over which cutoff frequency changes from

one point to the next point (for example, time during which

the cutoff frequency changes from Level 1 to Level 2 for

Time 2).

Level1-4 (TVF envelope level 1–4)

Sets the TVF envelope level (Level 1–4) to determine cutoff

frequency of each point relative to the specified Cutoff

Frequency parameter value.

Envelope Depth (TVF envelope depth)

Adjusts degree of TVF envelope. Higher settings result in

more change. Negative (-) settings invert the envelope.

Velocity Curve (TVF envelope velocity curve)

Selects one of seven curves to set how keyboard playing

dynamics (velocity) influences cutoff frequency. The selected

curve is shown at the right of the number.

Time 1 Time 2 Time 3 Time 4

Level 3

Level 1

Level 2 Level 4

key is released

Cutoff

Frequency

Time

key is pressed

Chapter 3. Creating your own sounds

[PATCH]

➞

[F3] (TVF)

➞

[F1] (TVF Prm)/[F2] (TVF Env)

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Roland XP-80 Owner's Manual Page 52

Comments to this Manuals

Roland XP-80 Owner's Manual Page 52

Comments to this Manuals

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