Roland XV-88 owner manual Modifying the Brightness of a, Sound with a Filter TVF, TVF Filter

Time Keyfollow

(Pitch Envelope Time Keyfollow)

Use this parameter when you want the keyboard location of notes to affect times T2–T4 of the pitch envelope. Based on the pitch envelope times for the C4 key, positive (+) settings will cause notes higher than C4 to have increasingly shorter times, and negative (-) settings will cause them to have increasingly longer times. Higher settings result in more change.

Time
						+100
						+50
						0
						-50
						-100	Key
C1	C2	C3	C4	C5	C6	C7

V-T1

(Pitch Envelope Time 1 Velocity Sensitivity)

Use this parameter when you want keyboard playing dynamics (velocity) to affect T1 (Time 1) of the pitch envelope. Positive (+) settings will cause T1 to speed up for strongly played notes, and negative (-) settings will cause it to slow down.

V-T4

(Pitch Envelope Time 4 Velocity Sensitivity)

Use this parameter when you want key release speed to impact on T4 (Time 4) value of the pitch envelope. If you want T4 time to be speeded up for quickly released notes, set this parameter to a positive (+) value. If you want it to be slowed down, set this to a negative (-) value.

L0 (Pitch Envelope Level 0)

Specifies the pitch envelope level (L0). Pitch Envelope Level 0 determines the degree to which the pitch of the sound at the instant the key is pressed is altered relative to the reference pitch (the Coarse Tune or Fine Tune value set in the PITCH page). Positive (+) settings will cause the pitch to be higher than the standard pitch, and negative (-) settings will cause it to be lower.

T1–T4 (Pitch Envelope Time 1–4) ★

Specify the pitch envelope times (T1–T4). Larger values result in longer times until the next pitch is reached (for instance, T2 controls the time from L1 until L2 is reached).

Chapter 5. Creating Patches

L1–L4 (Pitch Envelope Level 1–4)

Set the level (L1–L4) for the Pitch Envelope. It determines how much the pitch changes from the reference pitch (the value set with Coarse Tune or Fine Tune on the PITCH page) at each point. Positive (+) settings will cause the pitch to be higher than the standard pitch, and negative (-) settings will cause it to be lower.

T1	T2	T3	T4
Pitch L0			Time
L1
			L3	5
Note on			Note off
				Chapter
		L2	L4
Modifying the Brightness of a
Sound with a Filter (TVF)

Here you can make settings for the TVF (Time Variant Filter). This allows you to modify the brightness or thickness of the sound, changing the timbre of the Tone.

TVF FILTER

Type (Filter Type)

Selects the filter type. A filter is a function that cuts off a specific frequency band to change a sounds brightness, thickness, and other qualities.

OFF: No filter is used.

LPF: A Low Pass Filter reduces the volume of frequencies above the Cutoff frequency (Cutoff parameter) 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 can be useful when creating distinctive sounds.

HPF: A High Pass Filter reduces the volume of the frequencies below the cutoff frequency. This is suitable for creating percussive sounds 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.

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