But in contrast to sound wave feedback there are the following advantages:
●
Feedback is possible at any sound volume, even if playing with
headphones.
●
This also works fine with crunch or clean sounds. With sound wave
feedback it would take a realy extreme amplifier gain to get the same
feedback tones.
●
The transition from normal tones into feedback can be controlled
exactely and always reproducible. You don't need any time consuming
experiments with amplifier gain and loudspeaker distance.
●
By the strong magnetic field, you can generate extreme feedback tones
which cannot be generated with normal amplifier/speaker feedback at
all.
1.2 Differences to the EBow
TM
and well known Sustainers
The most popular magnetic string vibration device is the EBow
TM
developed in
1976. This engenious gadget is a hand-held device build for one string
vibrations and a lot of interesting tone effects can be produces with it. The
typical EBow
TM
playing is a bow like movement rather than striking the strings.
You put the plectrum away before playing the desired effects. With this
technique cello like sounds can be produced for example. The EBow
TM
is
used all over the world for special effects in dedicated lead phrases.
Then Sustainers entered into the guitar world, which can be found in special
guitars or can be build in existing guitars. This is done by replacing the
original neck pickup by a so called Sustainer pickup. Unlike the EBow
TM
you
can play with both hands and you can play feedback with more than one
string at the same time. Another difference to the EBow
TM
is that the sound
cannot be controlled by the playing technique, because its position is fixed on
the guitar.
By contrast the Guitar Resonator has the following features:
●
You can use both hands for normal playing. Feedback comes by
positioning the guitar neck to the Resonator. This is basically similar to
the speaker positioning for normal amplifier feedback. However,
feedback starting and harmonics can be controlled much better by the
direct Resonator positioning. This feature is one of the main differences
to the build in Sustainers. Unlike the EBow
TM
you get feedback with
more than one string.
2
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