10.6

Table Of Contents
315Logic Pro Instruments
Unison button: Turn Unison mode on or off.
In Unison/Poly mode—where both the Unison and Poly buttons are active—each
voice is doubled. This cuts polyphony in half (to a maximum of eight voices, shown
in the Voices field). The doubled voices are detuned by the amount defined with the
Analog knob.
In Unison/Mono mode—where both the Unison and Mono or Legato buttons are
active—up to 16 voices can be stacked and played monophonically. The Voices field
displays the number of stacked voices that are heard.
Important: Stacking voices in Unison/Mono mode increases the output volume. To
avoid overloading the instrument channel strip output, set a low Level slider value and
gradually increase it. See Logic Pro EVOC20 PolySynth output parameters.
Logic Pro EVOC20 PolySynth formant filter
EVOC20 PolySynth features two formant filter banks—one for the Analysis section and
one for the Synthesis section. Each bank provides up to 20 individual filters. The entire
frequency spectrum of an incoming signal is analyzed by the Analysis section and is
divided equally into a number of frequency bands. These analysis filter bands are mirrored
by a corresponding number of bands in the synthesis filter bank. Each filter bank controls
the peak levels—the formants—within these frequency bands.
The Formant Filter display is divided in two by a horizontal line. The upper half applies to
the Analysis section and the lower half to the Synthesis section. Parameter changes are
instantly reflected in the Formant Filter display, thus providing invaluable feedback about
what is happening to the signal as it is routed through the two formant filter banks.