White’s Electronics Spectra VX3 - Manual (Page 46)

Page 4-9
Spectra VX 3 User’s Guide
If VCO audio is disabled then the all-metal audio response
will be a fixed tone, and an increasing signal level creates an
increase in its loudness:
In other words, as the search coil is passed over a target, the all-
metal audio will begin at a low volume and progressively rise in
loudness as the target signal gets stronger, peaking when the
search coil is directly over the target.
If VCO audio is enabled then an increasing signal level cre-
ates a rising audio tone or pitch:
In other words, as the search coil is passed over a target, the all-
metal audio will begin at a low tone and progressively rise in
pitch as the target signal gets stronger. The highest pitch is
achieved when the search coil is directly over the target (stron-
gest target signal) and then the audio falls in pitch as the coil
moves off the target. As with non-VCO audio, loudness also
rises and falls.
Tip: The human ear is more sensitive to changes in pitch
than to changes in loudness. Therefore, deep targets that
produce only a very slight all-metal signal will be easier to
discern using VCO audio. However, some people just don’t
like VCO audio or have hearing problems, so the option to
turn it off is also provided.
Incre
asing V
olume
Fixed Threshold Tone
In
creasin
g P
itch
VCO Threshold Tone