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BUILD NOTES, CONT.
Mids Switch vs. Presence Control
The legacy version of the Halo came with an optional modification, adding a fourth knob to control the
midrange contour, called "Body" or "Presence". This mod was created by Jack Orman of AMZ. More
information can be found in his
AMZ Presence Control
article.
While this modification adds a good deal of tonal flexibility, there is no position on the body knob that
removes it from the circuit and makes it 100% identical to a regular 3-knob Muff. If you look at an EQ
graph of the tone control with the presence modification, it just doesn't have quite the same response as
the original circuit in any of the positions.
As a result, the updated version of the Halo has been changed to have a 3-way switch that goes between
the stock setting (scooped mids), a mid hump, or a fully flat frequency response. This gives a similar
result but without
If you are interested in the presence knob modification, the
legacy version of the Halo
will continue to
be available.
HALO DISTORTION / SUSTAINER
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