Oberheim GM-400, Operating Manual

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Oberheim GM 400
Digital Signal Processor
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116
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The procedures are as described for the Tap Delay.
Control of the TAP pedal
When the Metronome Delay is active the TAP pedal is also operational. It is used to enter the
BPM not by editing but in real time, in relation to the speed of the song the musician is
performing.
In practice, the length of the delay will be set by measuring the time which passes between
two consecutive pressures on the pedal.
6.9 REVERBERATION (REV)
The last group comprises:
Reverb, Gate Reverb, Virtual Chamber.
THE REVERBERATION EFFECT
This effect is of fundamental importance and so we will describe it in greater detail than the
previous effects.
Reverberation is the result of a series of sound reflections. The order and value of each
reflection depends on the ambient in which it occurs. There are many factors in play within
any one room or hall, such as the dimensions of the place where the phenomenon occurs, the
nature of the material of which it is constructed and the objects it contains, and the position of
the listener. We will look at this concept in greater depth by analyzing the 3 main components
of natural sound together.
Direct sound: in practice, this is the sound emitted by the sound source which reaches our
ears directly without ever being reflected. If the value of this parameter is high, except for rare
exceptions the sound source and the listener are close to each other.
Early reflections: the sound is reflected a few times before it reaches our ears. The distance
and the frequency with which these reflections occur are closely linked to the dimensions of
the ambient in which they take place.
Late reflection - reverberation: before reaching and surrounding us, the sound has been
broken down countless times in the environment, acquiring a suffused, dense nature which
also depends on the material of which the ambient consists.
The sound which reaches our ears is therefore a complex blend of these fundamental
elements.
REVERB
Reverb is the classical ambient effect with two separate parts, which can be positioned
separately within time: early reflections and reverberation, or late reflection.