3.3. BASS DRUMS
CHAPTER 3. DRUM SYNTHESIZER
The oscillator section is not unlike that of the Noise BD, but with an important
difference: the asymmetry factor. The oscillator creates triangle waves again, that
are clipped using a soft saturation that rounds the corners and reduces the amount
of higher harmonics. The triangle oscillator however, can also be made asymmetric,
which induces a certain amount of even harmonics in the sound.
Symmetric waveforms, such as sinewaves, triangle and square waves have a left-
right symmetry, which invokes they only have odd harmonics. But sometimes it can
be interesting to have an amount of even harmonics in an electronic BD sound too.
Thus in general, the asymmetry parameter controls the amount of even harmonics in
the sound, while the drive parameter controls the odd harmonics.
The string sound section creates a little tick every time the oscillator passes zero,
thereby mimicking the sound of a string stretched over a drum head as sometimes
found on ethnic drum instruments. The string sound passes through a lowpass filter
that reduces the very high frequencies above 7kHz.
The randomization factor randomizes the strength of each tick. Without randomiza-
tion, the string sounds like a very narrow pulse oscillator. With a certain randomization
degree, it sounds more like something rattling along with the BD sound.
• X controls the wave asymmetry
• Y controls oscillator/string mix
• Z controls the wave clipping overdrive gain
• T controls string randomization
STRING BD
MIX
AMP
OUT
PITCH
ENV
Z
AMP
ENV
X
T
Y
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Summary of Contents for OS007
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