Friday, August 15, 2014

Moog Werkstatt Mod's Breakdown

I've received several requests detailing the mod's that I added to the werkstatt (which are seen in the video below), so, here's the list.



Inputs-

GATE: This one requires the most work.  There is no direct way to trigger the envelopes without modifying the circuit board.  A trace is cut, then wired to a switched jack, so when nothing is plugged in, the envelope is triggered by the keyboard.  When a jack is insterted, the connection is broke and the external gate will trigger the envelope.  There is a small circuit added (an op-amp and some resistors) to the input to stabilize the voltages going in.  Basically making sure that the voltage used is consistent and doesn't suffer from voltage drop.

VCO EXP: Jack wired directly to the patch point.  This is the 1V/Oct Input.  This input requires calibration of trimmer on the circuit board.

VCO LIN: Jack wired directly to the patch point.  Linear scaling.

LFO: Jack wired directly to the patch point.

VCA:  Jack wired directly to the patch point

CUTOFF FREQ: Jack wired to the VCF IN patch point.

AUDIO:  There is a jumper on the circuit board that's between the VCO Output and the VCF Input.  I removed the jumper and wired a switching jack in it's place so when nothing is plugged in, the VCO is fed into the filter.  When a jack is inserted, the VCO is silenced and the audio from the jack will pass through the filter only.  There are 2 reasons why I did this.

  1. There is no way of silencing the VCO, so whatever audio is sent through the filter will be blended with the VCO
  2. The VCO, to me, is sent to the VCF a little too hot.  This way, with an external attenuator I can regulate the volume of the VCO.  Also, it makes it easier to mix in other audio sources, such as other VCO's.
Outputs:

VCF: Jack wired directly to the patch point

LFO TRI & Square, VCO Saw & Square: Jack wired to the waves directly, regardless of the switches position.

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As the panel is custom one-off's which are ordered per job, I can change what jacks are added.  The panel I added to mine made the most sense for what I wanted, but you could have a competely different idea, like putting the keyboard and env CV OUT on jacks to control outboard gear with the werkstatt 1 octave keyboard.  Or, changing a jack to PWM Or, ditch one of the jacks to add a switch to turn the VCO to filter ON/OFF (or a potentiometer for volume control but this would require the space of 2 jacks).  If you have some idea's, send me an email and we'll go over the options.

Pricing:

Panel: $35. These are custom and made to order.  There is a 2 week lead time before they arrive.

Full Mod: $120.  This includes labor and all parts needed for the panel above. Any customizations may alter the price.  

NOTICE:  ANY MODIFICATIONS TO THE MOOG WERKSTATT WILL VOID THE WARRANTY!  Which is kinda funny because I work for a manufacturer and a large part of my job is warranty work.  But, unfortunately I don't work for moog, so the only warranty I can offer is on the work I do.  None of the mod's will damage the synth, so no worries there.


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