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.
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.
