Quadra & Expander Manual
Quadrature Mode
Quadrature Mode
links the function generators into two pairs of looping envelopes that have
interdependent timing. It vaguely resembles two waveforms that are phase shifted 90 degrees
relative to each other (hence the “quadrature” label). Each pair is independent and functions
identically, so we will concentrate on the function generator pair
1+2
for this section.
In this mode,
1
is triggered and retriggered by its own end of cycle.
1
will not enter its decay
phase until both
1
and
2
have completed their attack phase.
2
can either be triggered by the end
of attack of
1
, or by a gate or pulse sent to the
TRIG 2
input.
2
will not enter its decay phase
until it has completed its attack, and
1
completes its decay. This means that sometimes
2
will
retrigger before completing its decay phase because
1
may complete its attack first. If
2
is set to
cycle with short enough attack and decay values, it will cycle during
1
’s attack.
It may take some trial and error to gain a full understanding of how this mode works, and how
best to take advantage of its behaviour. Quadrature mode is great for creating out of phase
modulation of two related parameters. For example, modulating the waveforms or pulse width of
two oscillators.
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