Chapter 3
H910 Harmonizer
Production Dates 1975 – 1984
The Eventide Clockworks H910 was the world’s first harmonizer – and one of
the first commercially-available digital audio products. It offered built-in delay,
manual adjustment of +/- 1 octave and even had an ”Anti-Feedback” mode
which helped to eliminate feedback between a mic and speaker by constantly
”riding” room modes. Today’s Native Plug-in format captures all the realism
of the original, including its ”glitching” as it modifies the pitch. The origi-
nal HK940 keyboard option is replaced with more modern MIDI control that
allows you to ”play” the desired pitch using MIDI notes or bend it via pitch
wheel. Simply assign the connected controller to the H910’s MIDI channel (See
’Working with the Harmonizers’ for more detail.). The H910 Harmonizer is a
Mono-In, Mono-Out plug-in.
3.1 H910 Harmonizer Controls
3.1.1 Input Level
The Input LED will light at -0.5 dBFS. (Note that the Limit Indicator is ”after”
the Input Level and Feedback controls, so it will illuminate when internal clip-
ping is about to occur due to excessive input level or feedback.) Adjust Level
so that the Limit Indicator flashes only on input peaks.
3.1.2 Pitch Control Select
The three switches in this group allow you to activate the Anti-Feedback func-
tion, or to select whether you want manual or MIDI control over the pitch
change functions of the Harmonizer.
• MAN – This switch activates the MANUAL control knob. When fully
counter- clockwise, the output pitch is decreased by 1 octave (ratio=.5).
When centered, the ratio is unity. When fully clockwise, the output pitch
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