Moog Music MF-107 FreqBox - Manual (Page 10)

10
Electro Drumz
This setup
requires an extra
patch cable for
connecting the
envelope follower
out into the
Envelope Amount
input. For the
best results, Play
a sound with a
strong attack and a
quick fade, like a
very muted guitar
string plucked hard
Figure 10 - Electro Drumz
with a pick. This gives a REALLY sharp sweep of the VCO frequency
by the envelope follower so that you can make really percussive sounds.
The brightness of this percussive sound is controlled by how hard you
play. The expression pedal allows you to sweep from deep sounding
percussive sounds in the heel position to really high pitched sizzly
sounds in the toe position.
FREQBOX THEORY
Fundamentals of sound
Let's start with some definitions. Please read this section carefully, as it
will help you to understand the basic ideas underlying the FreqBox.
Sound is a vibration of the air. The speed of vibration is called the
frequency. It is measured in Hertz (Hz). One Hz is one cycle per second.
We hear vibrations from 20 Hz to 20,000 Hz. The lowest A on a piano
is usually tuned to 27.5 Hz, and the highest C is tuned to 4186Hz. Each
time you double a frequency, you hear a change of an octave. So the A’s
on a piano are tuned from low to high to 27.5 Hz, 55 Hz, 110 Hz, 220
Hz, 440 Hz, 880 Hz, 1760 Hz, and 3520 Hz. That’s seven octaves. The
loudness of a sound is called it’s amplitude. This relates to the strength of