Moog Music Etherwave Plus Kit (Upgrade Instructions) - Manual (Page 7)

Tuning and Testing
With all the components installed and connected, the next step is to make adjustments to the Etherwave’s tuning,
and try out the new features.
1) Install the theremin antennas.
2) Install the theremin on a mic stand.
3) Connect the Audio out to an amplifier.
4) Connect power. Turn the Etherwave Plus power on. The Power LED should light up red. If not, turn the power off
and see the troubleshooting section of the manual.
5) Set the Pitch tuning control to 9:00.
6) Adjust the amplifier so you are monitoring the theremin audio at a comfortable level. If you are not hearing any
theremin audio, proceed to the troubleshooting section.
7) Is zero beat at arm’s length from the pitch antenna? If not, then the theremin’s Fixed Pitch Oscillator (FPO) needs
adjustment.
8) Tune the FPO by adjusting L6 so that zero beat occurs when you are arm’s length from the pitch antenna, and the
Etherwave’s pitch rises smoothly as you approach the pitch antenna.
9) Replace cover – set the Pitch tuning control to 12:00, and check the position of zero beat. It should be at about
arm’s length from the pitch antenna. Repeat FPO adjustment if necessary.
10) Verify the function of the following front panel knobs: Volume tuning, Pitch tuning, Waveform, and Brightness.
11) Connect the voltmeter to the Gate output. Verify a +10V gate signal when the left hand is away from the volume
antenna AND your right hand is close to the pitch antenna (theremin audio must not be at zero beat).
12) Connect the voltmeter to the Volume CV output – verify an output of 0 to +10V as the left hand moves from
very close to far away from the volume antenna.
13) Connect the voltmeter to the Pitch CV output – verify an output that increases when approaching the pitch
antenna and decreases when moving away from the pitch antenna. The nominal level is set to -2.5V to +4.5V
for musical control, but will vary a little unit to unit because the voltage is derived from the frequency of the
theremin audio. Touching the pitch antenna may produce a CV as high as +7V. It takes two full cycles of the
theremin’s waveform to derive the Pitch CV output. When playing in the bass region, or making sudden moves
in the bass region of the theremin, the voltage may seem discontinuous, like a classic sample-and hold effect.
This is normal. When the theremin is at zero beat, the Pitch CV settles at the last voltage derived.
14) Connect a pair of headphones to the Phones out. Verify function of Phones level. To configure the headphone
output as a pitch preview see the section below called “Configuring the Headphones for “Pitch Preview”.
Congratulations – now you are ready to use the Etherwave Plus!
Using the Etherwave Plus
Below is a diagram of the Etherwave Plus Front Panel indicating the Panel Controls and Connections (figure 9).
figure 9