Roland SH-4d Owner's Manual page 6

An Overview of the SH-4d
Part
A "part" is a place where you can load a tone and save it together with settings such as pan and EQ.
The SH-4d contains five parts. You can select synthesizer tones for parts 1–4 and a rhythm kit tone for part R (the rhythm part).
The part whose sound you can edit with the controllers and play using the keyboard buttons is called the "current part".
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"Switching Between Parts(P.17)"
Tone
The sounds that you play in different pitches on the keyboard are called "tones".
A tone consists of an oscillator (OSC) that creates the basis of the sound, along with a filter, effect and other components to modify
that sound.
Rhythm kit
You can load instruments for rhythm sounds (rhythm instruments) into the set for part R.
One rhythm instrument can be assigned to each keyboard button to play.
A rhythm instrument consists of an oscillator (OSC) that stacks and plays back two built-in waveforms, along with a filter, effect
and other components to modify that sound.
D-MOTION
With this function, the tone parameter you set changes according to how you tilt this unit.
You can use the Matrix function at the same time to control many different parameters.
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