Besides the Spider CV and Matrix Pattern Sequencer, all devices have audio connectors on the back. The audio connectors carry audio signals to or from devices via virtual cables.
You do not have to use both outputs for devices with stereo outputs. Use the left output to use a mono signal from a stereo device.
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To monitor audio outputs from devices, the signals can be routed, either via the Main Mixer or directly, to the physical outputs of your audio interface via the Reason Essentials Hardware Interface (see “Manual audio routing”).
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Typically, if you are using an audio interface with stereo outputs, you will most likely use the Main Mixer to mix the audio signals to the master outputs.
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To route audio input signals from your audio interface to audio tracks in the sequencer, you just have to select the appropriate input(s) from the Audio Input drop-down list on the corresponding audio track (see “Selecting audio input(s) and defining mono or stereo”).
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This means that you never have to manually patch input signals from the Audio In jacks of the Reason Essentials Hardware Interface.
In the early days of synthesizers, before the MIDI protocol was invented, analog synthesizers could be interconnected using Control Voltage (CV) cables. For example, one cable would be used for controlling pitch while another would send a Gate voltage, basically telling a synth when to play a note and when to stop. The CV signal cables in Reason Essentials emulate this analog control system. CV signals are typically used to modulate parameter values, and do not carry audio.
For example, you could modulate a parameter with a CV signal generated by an LFO or an envelope generator on another device.
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Gate outputs/inputs are typically used to trigger events, such as note on/off values, envelopes etc.
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Gate signals produce on/off values, plus a “value” which could be likened to (and used as) velocity.
P-LAN is the internal system used for routing audio signals from Mix Channel and Audio Track devices, with their Main Mixer channel strips, to the Main Mixer Master Section device. P-LAN connections are not indicated by cables or similar in the rack - only by a display on the rear of Mix Channel and Audio Track devices.
The P-LAN connections are fixed and cannot be created or removed. However, if you use the Direct Out jacks on an Audio Track device or Mix Channel device, the internal P-LAN connection is broken. In this case, the audio from the Mix Channel/Audio Track device is not sent to the Master Section.
Normally, MIDI (e.g. note and performance data) are sent to devices from their respective sequencer track. No cables are used in the rack to indicate MIDI connections.