EXi: STR-1 Plucked String
230
4–8: Pickups/Feedback
4–8a: Pickup 1
Position [0…100.0]
This adjusts the location of the pickup along the string. You
can modulate this via AMS, to create effects similar to
chorusing. Unlike the Excitation Position, you can
modulate the Pickup Position while the note is sounding.
Typically, values between 8.0 and 25.0 will work well.¯
The effect of the Pickup Position is similar to that of the
Excitation Position. The comb filtering produced by the
excitation and the two pickups is cumulative, and can
produce complex patterns of peaks and valleys in the
frequency response.
The position is approximately symmetric around 50 for all of
the notes when Tracking Mode is set to Keyboard; in other
words, a value of 60 is roughly the same as 40. When
Tracking Mode is set to String, however, the point of
symmetry varies for each note.
For more information, see “How Position affects the timbre”
on page 221.
Harmonic and Pickup Positions
If the Pickup Position is same as the Harmonic Position,
the pickup won’t produce much sound when Harmonic
Pressure is applied.
Pickup Position and Note
The note being played defines another position along the
string. For instance, with a guitar, the note is the position of
the finger on the fretboard, as it presses down on the string.
This creates a temporary end point for the string. At this end
point, the string vibrates very little; beyond it, the string
doesn’t vibrate at all.
Pickups don’t “hear” the entire string; they only hear the part
of the string directly above them. If that part of the string
isn’t vibrating (for instance, if it’s being held down!), there’s
very little for a pickup to listen to–and thus the pickup won’t
produce much sound, if it produces any at all.
For example, let’s say that you were listening only to Pickup
1.
Set the Pickup Position to 50 (the middle of the string), and
the Tracking Mode to String Track. The open note of the
top string, E4, will sound fine. As you play higher notes,
however, the sound will become thinner, until it becomes
very quiet at E5.
What happened here?
The pickup stays in same location, right in the middle of the
string. With each semitone, the point at which the string is
being pressed down moves up one fret. When you reach an
octave up (at E5), the string is being pressed down in the
middle of the string, right over the pickup.
If you play even higher, the pickup produces no sound since
it is now outside the part of the string that is vibrating.þ (The
STR-1 model assumes that your finger can hold down the
string perfectly, so that no vibrations get past it.)
The higher the Pickup Position, the lower the range in
which this can occur. The normal range of a guitar is much
less than that of a 73- or 88-note keyboard, and higher
pickup positions may make sense (and make sound!) only
when playing within that normal guitar range.
Also, note that this can only happen when the Tracking
Mode is set to String Track.
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