User Manual

Appendix
Rocket User´s Manual 36
Glossary
Aftertouch
The majority of contemporary MIDI keyboards are cap-
able of generating aftertouch messages. On this type of
keyboard, when you press harder on a key you are al-
ready holding down, a MIDI Aftertouch message is gene-
rated. This feature is used to control the Cutoff frequency
of the Rocket.
Amount
Describes to which extent a modulation influences a
given parameter.
Amplifier
An amplifier is a component that influences the volume
level of a sound via a control signal. This control signal is
often generated by an envelope or an LFO.
Arpeggiator
An arpeggiator is a device that splits an incoming chord
into its single notes and repeats them rhythmically. Most
arpeggiators feature different sequence modes to cover a
wide range of applications. Typical controls for an ar-
peggiator are the octave range, the direction, the speed
and the clock, which means the repetition interval. Some
arpeggiators also feature preset or programmable rhythm
patterns.
Band Pass Filter
A band pass filter allows only those frequencies around
the cutoff frequency to pass. Frequencies both below and
above the cutoff point are damped.
Control Change (Controllers)
MIDI messages enable you to manipulate the response of
a sound generator to a significant degree.
This message essentially consists of two components:
• The Controller number, which defines the element to
be influenced. It can be between 0 and 120.
• The Controller value, which sets the extent of the
modification.
Controllers can be used for effects such as slowly
swelling vibrato and influencing filter frequency.
Decay
"Decay" describes the descent rate of an envelope once
the Attack phase has reached its zenith and the envelope
drops to the level defined for the Sustain value.