Roland XV-3080 owner manual 116, Cutoff TVF cutoff frequency, Resonance TVF resonance

Chapter 6. Creating a Rhythm Set

Modifying the Brightness of a Sound with a Filter (TVF)

The settings for the TVF (Time Variant Filter) allow you to change a Rhythm Tone’s timbral content by altering its brightness or thickness.

TVF FILTER

Type (TVF filter type)

This selects a filter type. A filter typically reduces, or attenuates, a specific frequency range within a Tone in order to accentuate its other frequencies.

OFF: No filter is used.

LPF: A Low Pass Filter reduces the volume of frequencies above the cutoff frequency in order to round off, or un- brighten, the sound. This is the most common filter used in synthesizers.

BPF: A Band Pass Filter reduces the volume of frequencies below and above the cutoff frequency range. This is most effective when creating sounds with strong characteristics since it can accentuate a desired range of frequencies anywhere in the sound.

HPF: A High Pass Filter reduces the volume of the frequencies below the cutoff frequency. This is suitable for creating percussive sounds by rolling of their lower frequencies, thus emphasizing their higher ones.

PKG: A Peaking Filter emphasizes frequencies around the cutoff frequency by raising their level. You can use this to create wah-wah effects by employing an LFO to change the cutoff frequency cyclically.

LPF2: Low Pass Filter 2. This reduces the volume of all frequencies above the cutoff frequency. This differs from LPF in that you can control the amount of the reduction using the TVF ENVELOPE settings while still maintaining a fixed cutoff frequency.

This can be very effective with acoustic-instrument-based Tones, since nothing is done to weaken the power and energy of the sound.

* This disables the Resonance setting.

LPF3: Low Pass Filter 3 reduces the volume of frequencies above the cutoff frequency. While similar to LPF2, it filter reduces the frequencies more gently than LPF2.

This can be very effective with acoustic-instrument-based Tones, since nothing is done to weaken the power and energy of the sound.

* This disables the Resonance setting.

Cutoff (TVF cutoff frequency) 0–127

This selects the frequency at which the filter begins to have an effect on the waveform’s frequency components.

With LPF/LPF2/LPF3 selected for the Filter Type parameter,

lower cutoff frequency settings reduce a Rhythm Tone’s upper harmonics for a more rounded, warmer sound. Higher settings make it sound brighter.

When Filter Type is BPF, the cutoff frequency setting determines the range of frequencies within the Rhythm Tone that will be heard. This can be useful when creating distinctive sounds.

When Filter Type is HPF, higher settings of the cutoff frequency decrease the level of the Rhythm Tone’s low frequencies, preserving its brighter qualities.

When Filter Type is PKG, the cutoff frequency setting determines the range of frequencies to be emphasized.

Resonance (TVF resonance) 0–127

This increases the level of the cutoff frequency to add a popular classic synth character to the sound. Excessively high settings can produce oscillation, causing the sound to distort.

LPF	BPF	HPF	PKG
Level
High
Frequency
Cutoff frequency
parameter value
Low
TVF VELOCITY

This sets the amount of change to the original cutoff frequency in response to differences in velocity, as well as the velocity response curve and velocity’s effect on Resonance.

V-Cutoff (TVF cutoff velocity sensitivity) -63– +63

This sets the amount of change to the Cutoff setting to be applied as a result of changes in playing velocity. With higher settings, there is a greater amount of change between softly and strongly played notes. Negative (-) settings reverse the direction of change.

V-Curve (TVF cutoff velocity curve) FIXED/1–7

This selects one of seven curves that determine how keyboard playing dynamics (velocity) influence the Rhythm Tone’s cutoff frequency. The selected curve is displayed graphically to the right of its value.

When V-Curve is set to “FIXED,” the cutoff frequency remains unchanged regardless of how hard or soft the keys are played.

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