Arturia ARP2600 V, Руководство пользователя

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62 ARTURIA – ARP2600 V – USER’S MANUAL
With a high resonance level, the filter will begin to produce a sound close to a sine waveform. At
this stage, the use of a key follow is very important as you can create a melody by tuning the cut-
off frequency of the filter along with the frequency of the oscillators.
6.1.3 The amplifier or VCA
The amplifier (Voltage Controlled Amplifier) is charged with receiving the audio signal coming from
the filter (or directly the one from the oscillator if it is not filtered) to adjust its volume with a
potentiometer, before the signal is directed to the speakers.
the ARP 2600V amplifier
In conclusion, here is a scheme that may help you to understand the composition of a basic sound:
6.2 Complementary modules
6.2.1 The keyboard
If we hold down a key at this stage, the sound you will get from the speaker will be uniform, with-
out life and without end! In fact, the oscillator delivers a continuous signal (the audio output of a
wave form) of a fixed pitch. The only means of stopping this sound that quickly becomes unsupport-
able is by lowering the filter cut-off frequency so that it becomes more and more thick until it dis-
appears; or more simply, to lower the volume of the amplifier!
•
To trigger and stop this sound, at the tone that we want, we use a keyboard, which
will be connected to the oscillator. This will “play” as soon as a key is pressed and
will mute it as soon as released. Of course, this connection is made through MIDI (it
replaces the “gate” type connection of analog synthesizers, which triggers the
sound when the key is pressed and stops when released).
•
In the second case, so that the sound is correctly tuned with the keyboard notes, we
need to apply a key follow modulation (replacing the 1Volt/octave control present
on most analog synthesizers).