PART 1
Technology and Theory
90
pad is playing – there will be a gradual rise in the amount of harmonics con-
tained within the pad.
If a positive fi lter envelope was employed to control the fi lter’s action and the
envelope amount was set to fully modulate the fi lter, by using a long attack,
short decay, low sustain and fast release, the fi lter’s action would be introduced
slowly before going through a fast decay stage and moving onto the sustain.
This would create an effect whereby the fi lter would slowly open through the
course of the amplifi er’s attack, decay and sustain stage before the fi lter entered
a short decay stage during the ‘middle’ of the amp’s sustain stage. Conversely,
by using the same fi lter envelope settings but applied negative the envelope
is inverted creating an effect of sweeping downwards rather than upwards.
Nevertheless, the amp and fi lter envelopes working in different time scales
create a pad that evolves in harmonic content over a period of time. Notably,
this is a one-way confi guration because if the function of these envelopes were
reversed (in that the fi lter begins immediately but the amplifi er’s attack was set
long) the fi lter would have little effect since there would be nothing to fi lter
until the pad is introduced.
This leads onto the subject of producing timbres with a high harmonic content
and this is accomplished by mixing a series of oscillators together along with
detuning and modulating. The main principle here is to create a sound that
features plenty of harmonics for the fi lters to sweep, so this means that saw, tri-
angle, noise and square waves produce the best results although on some occa-
sions a sine wave can be used to add some bottom end presence if required. A
good starting point for any pad is to use two saw, triangle or pulse wave oscil-
lators with one detuned from the other by ⫺3 or ⫺ 5 cents. This introduces a
slight phasing effect between the oscillators helping to widen the timbre and
make it more interesting to the ear. To further emphasize this detuning, a saw,
triangle, sine or noise waveform LFO set to gently and slowly modulate the
pitch or volume of one of the oscillators will produce a sound with a more
analogue feel while also preventing the basic timbre from appearing too static.
If the pad is being used as a lead or has to fi ll in a large ‘hole’ in the mix then
it’s worthwhile adding a third oscillator and detuning this by ⫹3 or ⫹5 to
make the timbre more substantial. The choice of waveform for the third oscil-
lator depends on the waveform of the original two but in general it should be a
different waveform. For instance, if two saws are used to create the basic patch,
adding a third detuned triangle wave will introduce a sparkling effect to the
sound while replacing this triangle with a square wave would in effect make the
timbre exhibit a hollow character. These oscillators then, combined with the
previously discussed envelopes for both the fi lter and the amp, form the foun-
dation of every pad sound, and from here, it’s up to the designer to change the
envelope settings, modulation routings and the waveform used for the LFOs to
create a pad sound to suit the track. What follows is a guide to how most of the
pads used in dance music are created but it is by no means the defi nitive list
and it’s always experimenting to produce different variations.