Instruments and Effects

Table Of Contents
112 Chapter 6 Filter
 You can add notes to the chosen scale or chord by clicking keys on the small
keyboard, and remove notes by clicking notes already selected. Selected notes
appear bright green. Selecting any notes sets the Root/Scale value to user.
 Your last edit is remembered. If you choose a new scale or chord, but do not make
any changes, you can jump back to the previously set user scale.
You can automate the Root and Scale parameters and the keys of the onscreen
keyboard in Logic Pro.
 Max Track value field: Sets the frequency above which the high frequencies of the
analysis signal are cut, making the pitch detection more robust. Should the pitch
detection produce unstable results, reduce the Max Track parameter value to the
lowest possible setting.
Formant Filter Section
The parameters in section control the two formant filter banks of the
EVOC 20 TrackOscillator.
 Formant Filter graphic display: Shows the frequency bands for the analysis and
synthesis parameters.
The Formant Filter display is divided into two sections by a horizontal line. The upper
half applies to the Analysis section and the lower half to the Synthesis section.
Changes made to the High/Low frequency parameters, the Bands parameter or the
Formant Stretch and Formant Shift parameters will result in visual changes to the
Formant Filter display. This provides you with invaluable feedback on what is
happening to the signal as it is routed through the two formant filter banks.
 Frequency bar and fields: The blue bar above the upper row of faders controls the
upper and lower frequencies for both filter banks. Drag the bar to move both the
upper and lower frequencies, drag the left end to move only the lower frequency
(the value range is 75 to 750 Hz), or drag the right end to move only the upper
frequency (the value range is 800 to 8000 Hz). You can also edit the numerical values
above the bar directly (between 80 and 8000 Hz).
 Lowest button: Sets whether the lowest band of each filter bank acts as a lowpass or
bandpass filter.