Metatron Sample-Hold Filter

The Metatron is a project I’ve been working on for years but never had time to complete. In the video I am using a nearly completed version of the most recent prototype. The pedal is based on the Maestro Filter Sample/Hold pedal which has been discontinued years ago. While sonically they may be similar, the signal path is 100% original and in no way a copy of the Maestro. You can expect modern amenities such as true bypass, 9V power (no worries about dual batteries or 18V adapters as found on the original and clones of the original), possibly a blend control to tame the novelty aspect of the pedal, and so on. Email to be put on an unofficial mailing list regarding this specific pedal.

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Dan Armstrong Purple Peaker Rehousing

These devices are certainly unique but the fact that they mount directly to your instrument isn’t acceptable for many guitarists. Here is a rehousing with the addition of a DC jack and a volume control. The layout allows room for a bypass footswitch to be added in the future if needed.

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Fuzz prototype update

In an effort to improve the 8-Bit fuzz (and possibly make it Bass guitar friendly) I started working on this prototype. The knobs are as follow: thickness selector, gain, input bias, – cut, + cut, feedback recovery, volume, and a focus switch. Expect to see add-on options for the 8-Bit Fuzz in the future. Controls to adjust the amount of glitch (sonic stability control) and to increase the sustain should be available soon.

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Napkin rehousing project

After speaking with a client he requested that his tone generator be rehoused from its cigar box into a steel napkin dispenser. The difficult part was fitting everything into a smaller face while clearing the internal springs of the napkin dispenser. This is what I received to work with:

A quick scan and some measurements of the internals gave me a layout that would be acceptable. This involved quite a bit of measuring to keep the components clear from any moving parts.

Once the drilling was completed it was a matter of lengthening wires to make it all fit and populating the casing.

And there we have it, a completed rehousing.

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Monster Face Organ video

Finally an update of a device posted a few weeks back.

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Confused about True Bypass and why you may want it?

Confused about True Bypass and why you may want it? Here’s some information:

Mechanical bypass is a method of physically switching the signal. Above is a diagram showing a common method of bypass switching found in older Electro Harmonix pedals, wahs, and various other pedals. The signal is always connected to the input of the effect’s circuitry which loads down the signal. This can cause added noise, decreased volume, and a loss of brightness. The diagram above disproves the common misnomer that only true bypass pedals will pass a signal when the battery power is disconnected. This circuit will pass the uneffected signal even if a battery is not installed.


True bypass switches both the input and output of the effect’s circuitry. The signal should go from the input jack, to the switch, to the output jack without any other components in the signal path. This is the purest form of bypass and is essentially has the same impact on your tone as running a small patch cable. The effect’s circuitry is completely isolated from your signal path when bypassed.


Electronic bypass comes in a few forms but using transistors such as FETs is the most commonly used method. This is popular with Boss, DOD, Ibanez, Danelectro, Digitech, and many other manufacturers. The signal is always flowing through some form of active circuitry (referred to as a buffer) and uses transistors to switch the effect in and out of the signal path. If you remove the battery power the signal will not pass through the pedal.

Check out the True Bypass link on FXdoctor Website if interested in having this work performed on your pedals.

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Roll Cage

Fragile, unprotected sliders inches from a footswitch is a recipe disaster; especially on a dark stage. A simple roll cage setup allows access to the sliders while protecting from falling mics, inaccurate feet, and wandering pedals.

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Always use the right power supply…

Surprisingly this pedal was still function despite the significant damage done to the circuit board and part of the power supply circuit.

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Surface Mount ICs

Upgrading opamps for better sound quality is very common request. The commonly used (and dirt cheap) JRC4558 may be popular for Tubescreamers but is not be ideal for circuits when you want the most transparent sound. Burr-Brown and other companies make excellent chips to retain sonic fidelity. Above is a photo of their surface mount chip which was used to upgrade the signal path in an EHX Holier Grail.

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Monster Face "Organ"


I’m not sure what exactly inspired this, but it’s a 10 note sine wave generator giving you all sorts of beeps. The fun part is that each button’s frequency can be adjusted and playing more than one at a time gives entirely different frequencies. Videos to be posted when time permits.

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