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Osc 1
This is where you will find the controls for adjusting oscillator 1.
> SHAPE
This defines the shape of the waveform generated
by osc 1. When set to 0, the waveform will be
whatever is selected with the Wave Select knob.
Moving the knob in a clockwise direction will result
in a gradual transition to a pure saw wave at value
64 (default). As you continue to increase the value above 64, a square wave will be gradually
mixed in with the saw until, at a value of 127, a pure square wave is achieved.
> WAVE SELECT
The Wave Select knob allows you to choose from one of 64 waveshapes, including sine, tri-
angle and 62 additional
spectral
waves. This parameter has no effect unless the value of
osc 1 SHAPE is between of 0 – 63.If you just want the pure waveform, set osc 1 Shape to 0.
If you would like to see a graphical representation of these waveforms, see the Appendix.
> PW
This determines the width of the pulses in a square wave, or the
pulse width
. At a setting of 0,
the wave is completely square – the pulse has 50% of the wave cycle. As you increase the
value, the pulses become thinner until, at a value of 127, they have 0% of the wave cycle,
resulting in silence.
> SEMITONE
This determines the pitch for osc 1, and is adjustable in semitone intervals. The default set-
ting is 0, at which middle C will sound like middle C, but you have the option of transposing
osc 1 anywhere within a 4-octave range above or below this point.
> KEY FOLLOW
This determines how MIDI note number affects the pitch of osc 1. At the default setting of
+32, playing an ascending chromatic scale (play every key in sequence, including the black
keys) will cause the pitch of osc 1 to rise in semitone intervals. At a setting of +63, playing the
indigo powercore manual.book Page 38 Thursday, April 22, 2004 12:23 PM