PD4 Dual Preamp - I am heavy into the design of the new preamp. New features are:
Dry signals from the pickups can be sent to a high pass filter in the middle (post blend) position. The new HT4 high-pass filter can be used in a switched configuration for treble boost, or as a pot controllable high pass filter.
The bypass switches will move to the preamp, and the filter loop jumpers for unused filter connections will go away (there will be an onboard switch). This will make the filters simpler and cheaper, and improve the performance of the bypass, since the signal chain is shortened significantly, and they are "true bypass". The filters can be simpler and cheaper as a result, and the old filters will still be compatible.
FT4 High Pass Filter
This is perhaps the most requested feature, mainly by the "Wal-Nuts", and will plug into the post-blend ("mix") filter position. It takes dry signals from the pickups (the blend being set with a trimmer) and mixes treble frequencies back into the final signal. The filter parameters can be set on the filter board and activated with a switch, or controlled with a dual concentric pot (or two pots!). I am making a prototype now.
FP4 Dual Band Parametric Filter
A dual band medium width parametric filter with maximum 9dB variable boost and cut on each band. The low filter will control frequencies in the 65-700 Hz range, and the high filter in the 350-4000 Hz range. The overlap is so one filter can be used as say a treble boost or low bass cut, and the other will still give a midrange control. Or both filters can be used to extend the width of mid boost and cut.
Control is with the same separate or dual concentric pots as the FV4 variable filter. This means you could swap from a parametric to a dual filter based setup without using a single tool! Just unplug and plug a few cables (think of the Underhill system as a tiny onboard pedal board!)
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