Virtual DN-780 effects 249
XL8 Control Surface
Operator Manual
LF key
LF is adjustable to ±7, depending on room size and decay time, as shown on display f3.
An increase in LF decay time is generally desirable on simulations of large halls, since
low frequency sounds suffer less than higher frequencies from absorption in air. Very
small spaces usually need the ‘thin’ sound created by reducing LF decay.
HF key
HF is adjustable to ±7, as shown on display f4. The HF decay control sets the
absorption characteristic of the simulated space. In reality, large environments feature
considerably reduced high frequency decay times due to air absorption. A smaller room
will feature greater HF decay time if the walls are tiled and the room is empty than if
the room contains soft furnishings and curtains. The wide range of control provided will
allow a suitable setting to be chosen to enhance realism in most applications.
Room size
Room size is adjustable from 8 to 90 linear metres, representing a wide range of
volumes. Since the acoustic character of a given environment depends not only on the
reverberation time and construction of the room, but also to a great extent on its
volume. The room size control is, in fact, essential if authentic simulation of a range of
different sized environments is required. Small room sizes give a confined, ‘box-like’
sound. Medium room sizes suggest a room or small hall, whereas large room sizes
suggest a large hall or cathedral. Again, there is no substitute for experimentation.
Special effects programs
The Virtual DN-780 effect, unlike many reverberation-only devices, can run a number of
different effects programs. These cover a wide range of applications from straight
delay, through a variety of echo effects to the surreal sound of the Infinite Room
program.
The combination of excellent audio performance and digital signal processing power
results in a performance advantage over most existing effects and echo devices.
The effects programs, which are detailed in the following subsections, are available in
the reverb algorithms, while a subset of the parameters is available in the special FX
algorithms (Alive, Non-Linear, Reverse etc.).
Recalling an effect
Press the algorithm select button on the front panel (see page 246) to select the
required effects program.
Whenever a particular effect is first selected, parameters will always be set the same,
giving a known reference point from which to create the exact effect required. Unused
parameter displays are blanked in effects programs.
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