Add a full size copper pour and use the tStop layer to add gold decals
when ENIG finish is specified.
* Add symbols for input, cv, and output jacks, and add infinity logo to
the tStop layer.
* Add input, output arrows and signal chain markers to the tPlace layer.
* Change title to be on one line, since it fits.
Originally the PCB height was 1170 mils however this would likely
interfere with the rails when in a 1u row. Reduce the size to 1130 mils
in line with the Pulp Logic specs.
Add a shotkey diode to output of the CV conditioning stages to dump
negative voltage to ground. The maximum voltage range sent to the VC
pins of the AS3360 is 0-2.1V.
Add documentation to the schematic detailing how each chip is configured
and suggesting alternative resistor values for the first CV conditioning
stage for 0-5V and 0-8V operation.
Design uses the [AS3360D](http://www.alfarzpp.lv/eng/sc/AS3360.pdf)
chip. CV inputs are passed through a two inverting opamp stages which
first clip then scale the CV voltage to the operating range of 0-2V.
This results in 0-8V control voltage controlling the full amplitude of
the signal from the input jacks, the outputs are then buffered using a
unity gain opamp to drive the load.
