Flipping the Neptune around reveals an array of connection possibilities. Some of these are CV (control signal) related and some are audio signal related.
The Note input allows you to control the pitch of either the Pitch Adjust or Voice Synth (depending on what is currently selected in the MIDI Input section - see “MIDI Input”). The pitch could be controlled from a Note CV output of a Matrix or an RPG-8, for example.
The Gate input should be used in combination with the Note modulation input (see above). As soon as a gate signal is present, any note modulation on the Note input will be activated. The Gate could be controlled from a Gate CV output of a Matrix or an RPG-8, for example.
These control voltage (CV) inputs can be used for modulating various Neptune parameters from other devices. The inputs control the following parameters:
The Pitch Bend input allows you to control pitch bend of either the Pitch Adjust or Voice Synth (depending on what is currently selected in the MIDI Input section - see “MIDI Input”). The pitch bend could be controlled from a Pitch Bend CV output of an RPG-8, for example.
The Mod Wheel input allows you to control the Vibrato amount of either the Pitch Adjust section or Voice Synth (depending on what is currently selected in the MIDI Input section - see “MIDI Input”). The Vibrato could be controlled from a Mod Wheel CV output of an RPG-8, for example.
The Formant Shift input allows you to control the Shift parameter in the Formant section from a CV source on another device. The Formant Shift parameter accepts bipolar control signals (-63 to +64).
The Pitch output allows you to control the pitch of other devices from the Pitch Adjust section, either directly or via the Transpose section (depending on if Transpose is active or not). The Pitch CV corresponds to the pitch of the pitch adjusted and transposed signal. The Pitch output could be connected to the OSC Pitch CV input of another synth device, for example.
Neptune features an internal envelope follower. The Amplitude output sends out a control signal from this envelope follower based on the audio input level to Neptune. The Amplitude output could be connected to the Master Volume or Level CV input of a synth device, for example.
Connect to these outputs if you want to break out the audio from the Voice Synth as separate signals and, for example, route to a separate Mix Channel for separate processing.
The Left and Right outputs are the main stereo outputs of Neptune. Here, the audio from the Pitch Adjust, Transpose and Formant sections are routed. If the Voice Synth Sep Output (see “Voice Synth Out”) are not connected, the Voice Synth audio output are also routed to the main outputs.