Subtractive Synthesis (Theory); Initial Start-Up; Using The External Audio Input; Technical Data Of The Cv And Gate In- / Output - Spectral Audio neptune Bedienungsanleitung

4.2 Subtractive Synthesis (Theory)

The VCOs produce very harmonic rectangular and sawtooth signals:
Noise contains an endless number of frequencies. This frequency spectrum is subsequently limited by the
filter:
The setting of the resonance regulator is an important factor as it amplifies the frequencies around the cut-off
frequency:

5. Initial Start-up

Connect the MIDI IN socket on the Neptune to your MIDI sender (master keyboard, sequencer, ...) via a MIDI
cable. If further MIDI units are used after the Neptune, connect the MIDI Thru socket to the MIDI IN socket of
the next equipment by means of a further MIDI cable.
Connect the audio output with the audio input of your sound mixer, amplifier or similar equipment.
Connect the mains cable.
Switch on the Neptune. The GATE / LEARN indicator must light briefly. The POWER indicator and the SLIDE
indicator must light. If you now play on your MIDI keyboard and have selected the correct MIDI channel and
reference note (see para. 5, MIDI Functions), it should be possible to hear something. If this is not the case,
please refer to para. 4, Troubleshooting. For the first start-up, the Neptune is set to MIDI channel 1.

5.1 Using the external audio input

In order for the external signal to be audible, turn the wave switch from VCO 2 to EXT and the volume regulator
VCO 2 on maximum. Moreover the Neptune must simultaneously receive a note command, so as to enable it to
drive the VCA. This means that a connection is required at MIDI In, even if the Neptune is only being used as a
filter.

5.2 Technical data of the CV and GATE In- / Output

The Controll Voltage (CV) has a slope of 1 V/Octave. The gate socket used as an output issues a signal of
+5V. If you use this as an input, input signals up to +15V may be applied.
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