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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