The Etherwave Plus Field Upgrade from Moog allows you to upgrade your Etherwave Theremin to an Etherwave Plus by adding gate, pitch, and volume control voltage outputs along with a headphone output, headphone volume pot and knob, and power LED. By upgrading you will also be able to use the headphone output as a pitch preview out.
This upgrade includes an Etherwave Plus printed circuit board, a new front panel, a headphone volume pot, a headphone volume knob, a headphone jack, an on/off switch, LED indicator, and a drilling template for the bottom of your Etherwave Standard.
Note:
This kit requires drilling and soldering for installation.