Novation X-Station - Synthesis Tutorial; Envelopes And Amplifier; Cut off frequency

The diagram below shows the response of a typical low pass filter.
Frequencies above the cut off point are reduced in volume.
When resonance is added, frequencies at the cut off point are boosted
in volume.
In addition to the traditional Low Pass Filter type, there is also a High
Pass and Band Pass Filter. The type of Filter used is selected by using
the front panel Filter TYPE button.
The High Pass Filter is similar to the Low Pass Filter except that fre-
quencies below the cutoff frequency point are removed. Frequencies
above that point are passed. When the FREQUENCY knob is set fully
anti-clockwise, the filter is set completely open and no frequencies are
removed from the raw Oscillator waveforms.
When the Band Pass Filter is used, only a narrow band of frequencies
centered on the cutoff frequency point are let through. All frequencies
outside this band are removed. It is not possible to fully open this type
of Filter, allowing all frequencies to pass through.
Envelopes And Amplifier
In earlier paragraphs, it was determined how the pitch and timbre of a
sound are synthesized. This final part of the Synthesis Tutorial
describes how the volume of sound is controlled. The volume through-
out the duration of a sound created by a musical instrument often varies
greatly according to the type of instrument.
An Organ sound quickly attains full volume when a key on the keyboard
is pressed. It stays at full volume until the key is released, at which point
the volume level falls instantly to zero.
A Piano
quickly attains full volume when a key is pressed and gradually
falls back down to zero after several seconds, even if a key is held.
A String Section emulation
attains full volume gradually when a key is
pressed. It remains at full volume while the key is held down, but once
the key is released, the volume level gradually falls to zero.
SYNTHESIS TUTORIAL
Envelopes And Amplifier
• 33 •
Frequency
Volume
Cutoff
Frequency
Volume
Frequency
Cut off
frequency
Volume
Frequency
Cutoff
Frequency
Volume
Frequency
Cut off
frequency
Frequency
Volume
Cutoff
Frequency
Frequency
Volume
Cutoff
Frequency
Key "On" Key "Off"
Volume
Key “On”
Key “Off”
Volume
Time
Key "On" Key "Off"
Volume
Key “On”
Key “Off”
Volume
Time
Key "On" Key "Off"
Volume
Key “On”
Key “Off”
Volume
Time