Roland XP-30 Modifying the Brightness Sound with a Filter TVF, PCH Time ENV Pitch Time Envelope

Chapter 3. Creating Your Own Sounds

Velocity Sens (Pitch Envelope Velocity Sensitivity)

Set this parameter when you want your keyboard playing dynamics to affect the amount of pitch change. For higher settings, there will be a greater difference between softly and strongly played notes. Negative (-) settings will invert the direction of change.

PCH TIME ENV (Pitch Time Envelope)

These parameters determine how keyboard playing

dynamics will affect the times of the Pitch Envelope.

V-T1 (Pitch Envelope Time 1 Velocity Sensitivity)

Use this parameter when you want keyboard playing dynamics (velocity) to affect T1 (time) of the Pitch Envelope. For higher settings, there will be a greater difference between softly and strongly played notes. For positive (+) settings, keyboard velocity will speed up the T1 time. For negative (-) settings, keyboard velocity will slow down the T1 time.

V-T4 (Pitch Envelope Time 4 Velocity Sensitivity)

Use this parameter when you want keyboard playing dynamics (velocity) to affect T4 (time) of the Pitch Envelope. For higher settings, there will be a greater difference between softly and strongly played notes. For positive (+) settings, keyboard velocity will speed up the T4 time. For negative (-) settings, keyboard velocity will slow down the T4 time.

Time Keyfollow (Pitch Envelope Time Key Follow)

Use this parameter when you want the keyboard location of the note to affect the times (T2–T4) of the Pitch Envelope. Higher settings of this parameter will cause greater time change relative to the envelope time at middle C (C4). Positive (+) settings will cause the time change to become shorter for notes to the right of middle C. Negative (-) settings will cause the time change to become longer for notes to the right of middle C.

PCH ENVELOPE (Pitch Envelope)

These parameters set the Pitch Envelope (the shape of the pitch change over time).

T1	T2	T3	T4
L1
			L3
Pitch				Time
key is		L2	key is	L4
pressed			released

T1–4 (Pitch Envelope Time 1–4)

Set the times over which the pitch will change from one point to the next.

L1–L4 (Pitch Envelope Level 1–4)

Set the amount of pitch change (relative to the basic pitch) for each point.

■Modifying the Brightness of

Sound with a Filter (TVF)

The parameters in this group allow you to use the TVF (Time Variant Filter) to modify the frequency characteristics of the sound.

FILTER

These parameters are the TVF filter settings.

Type (Filter Type)

Select the filter type.

OFF:filter not used.

LPF (Low Pass Filter): Cut the frequencies above the Cutoff Frequency. This is the most common type of filter used in synthesizers.

BPF (Band Pass Filter): Pass only the frequencies in the area of the Cutoff Frequency.

HPF (High Pass Filter): Cut the frequencies below the Cutoff Frequency.

PKG (Peaking Filter): Emphasize the frequencies in the area of the Cutoff Frequency.

Cut (Cutoff Frequency)

Set the frequency of the filter.

Res (Resonance)

Emphasize the frequencies in the area of the Cutoff Frequency. For some settings, excessive levels can cause oscillation and distortion.

LPF	BPF	HPF	PKG
Level
High
Frequency
Cutoff frequency
parameter value

Low

Keyfollow (Cutoff Frequency Key Follow)

Use this parameter when you want the Cutoff Frequency to be affected by the keyboard position.

Higher values will result in greater change relative to middle C (C4). Positive (+) settings will make the Cutoff Frequency rise as you play further the right of the keyboard. Negative (- ) settings will make the Cutoff Frequency fall.

EnvDepth (TVF Envelope Depth)

Adjust the depth of the TVF envelope. Higher settings will result in greater change. Negative (-) values will invert the envelope.

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