FXpansion DR-008 - Manual (Page 23)

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fxpansion DR-008
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(‘Amp DC1’), and a slower linear decay ‘Amp DC2’ The ratio between these two
envelopes – which, in effect, controls the shape of the overall amplitude decay
envelope – is set by the ‘Amp Ratio’ control.
4.3.2 HiHat
An analog-style hi hat tone generator, based on a tone
signal and noise signal mixed and then fed through a
high-frequency bandpass filter. NoiseDcy and ToneDcy
control the decay rates of, respectively, the noise signal and the tone signal. The
tone signal is in fact generated from two ring-modulated sinusoid waves – Freq A
and Freq B control the frequencies of these two oscillators. Cutoff and Resonance
control the filter, as you would expect; Mix controls the relative levels of the noise
and tone components of the signal.
4.3.3 SnareDrum
An analog-modelled snare drum with a three-
oscillator architecture. Oscillator 1 and 2 are
identical:- noise generators with Decay, Cutoff,
Resonance and Mix parameters. These set,
respectively, the amplitude decay time; the cutoff
frequency of a bandpass filter; the resonance or Q of the bandpass filter; and the
level of the oscillator in the overall output signal. Usually you would use one of
these oscillators to create a high-frequency ‘snappy’ sound, at around 3KHz with
a short decay time, and the other at a lower frequency – say 700Hz – lower
overall volume, and longer decay time to create a irsnare reverblc sound. The final
oscillator is a swept pitch oscillator, with ‘Pitch’, ‘Pitch Amount’ (pitch envelope
amount), ‘Decay’ (pitch envelope decay), ‘AmpDecay’ (amplitude decay rate) and
‘Mix’ (overall level). This oscillator is used to create the ‘body’ of the snare sound. In
addition to the oscillators, the Snare Drum has controls for Drive (a simple distortion
unit), and ‘Main’ (overall signal level).