Panning and Styles
'Panning' between left and right channels creates 'space' in our music. This gives a 'three dimensional' perception on what we are listening to. Any STYLE that you choose will already have had the PARTS 'panned' by 'default' .. but you can change the 'defaults' if you so wish. Registrations that you can choose directly from the keyboard will also have had the selected Voices 'panned'. But Voices that you choose from the many you have available will probably be panned to 'centre'. I would be quite happy with that .. unless I am choosing two voices eg. Piano and Strings, and then I would pan one of those to the right and one to the left. Then when I play single notes you will get the separation between the two instruments. It's much easier to distinguish between the two sounds when they are not one on top of the other. So most times when I play a piece, I just have my Voice 'panned to centre'. You could argue that this is the same as listening in mono. Well, yes it is, but the Style and Backing Parts form a significant chunk of the whole recording .. and they are in stereo.
Looking at Styles and the 'Style PARTS', here is one where you can hear quite clearly how the backing is programmed to use both left and right channels. Wear stereo headphones to get the full effect of how this sounds.
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Style backing DEMO
The Waveform for the above is as shown below. You can see from the green bars that they are not moving across together; and just by looking at the wave patterns you can see immediately that left and right channels are nowhere near the same. ie. the backing is in STEREO.
Which brings me back to having a recording that is in two-track mono. All the above technical considerations would be completely negated in a two-track mono recording. You need a stereo recording to show off your keyboard to it's full potential, and to enable others to hear your keyboard being played as you hear it.