87 chapter 5. creating patches, Tvf filter – Roland XV-88 User Manual

Page 87

Chapter 5. Creating Patches

Chapter 5

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.

fig.05-54.e

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).

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.

fig.05-65.e

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

fig.05-66

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.

+50

+100

-50

-100

Key

Time

Note off

Pitch

Time

Note on