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6.2.2.1 Cupl1 = Coupling 1->2
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This parameter determines the coupling between M1 and M2. As mentioned in the
general functional description, you can simulate the actions of two coupled membranes
in a real drum. The parameter 1_2 Coupling adds a part of the bandpass output of M1
to M2 and performs a little bit of frequency modulation too.
6.2.2.2 Cupl2 = Coupling 2->1
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This parameter determines the coupling between M2 and M1. This value can be either
positive or negative (offset 64). This controls at which phase (+/-) the bandpass signal
is coupled (added) from M2 into M1.
64 is the initial setting at which no interference occurs. If both coupling parameters
have the same sign, they gain each other and create a feedback vibration of both F-
OSC which sometimes can result in scream-like sounds if both F-OSCs have the same
pitch or are in an octave or 5th relation. At opposing signs, they attenuate each other.
Like 1_2 Coupling, 2_1 Coupling performs a little frequency modulation M2 -> M1 too.
By playing with these two parameters you can create those wave interferences and
interactions that are characteristic of membrane-like percussion sounds.
6.2.2.3 Noise
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The noise signal creates the snare drum noise or metallic attacks. The parameter Noise
controls the intensity of this signal. As can be seen in Pic.1, the noise signal is
processed by a noise envelope and is then mixed into the F-OSC network and a small
portion into the final VCA.
In the F-OSC network, the noise mixes up with the hit (trigger pulse) and the F-OSC
sounds in a similar way to a real snare drum and reaches a fairly homogeneous sound.
If Noise is cranked up too much (>180) it may lead to internal distortions that might,
nevertheless, be desired. In addition, the level and sound of the noise are affected by
the noise filter settings (see 5.3 Noiz Fil).
The noise may be either random white noise (MetNze 1 = <noi>) or metallic noise
made up by thousands of combinations of MetNze 1 and/or MetNze 2.
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ALPHA BASE Operating Manual
