Arturia KeyStep Pro Keyboard with Advanced Sequencer and Arpeggiator - Manual (Page 73)

5.2.5.2. Arp Octaves (Running a Multi-Octave Arpeggio)
By default, the arpeggiator will play the notes you hold down and stay within the limits of
that octave. Holding down 'Shift' and pressing one of the Arp Octave keys will extend the
notes beyond that range. When you change the octave range, the arpeggiator will also play
notes in the octave(s) below or above the chord you play.
Octave range settings:
Octave Function
-1 held down notes plus the same notes repeated one octave below
0 only notes held down on the keyboard are played
+1 held down notes plus the same notes repeated one octave above
+2 held down notes plus the same notes repeated two octaves above
+3 held down notes plus the same notes repeated three octaves above
The arpeggiator has another freaky feature that becomes apparent when you press the
Octave Down or Octave Up arrow button (under the 'Shift' button) while an arpeggio
is playing. On most arpeggiators, pressing an octave down/up button will transpose all
currently held notes in the arpeggio one octave down or up. Uniquely, the KeyStep Pro's
arpeggiator will preserve the pitch of your arpeggio. If you shift the octave down or up, the
new notes you play will be added to the existing arpeggio in the new octave range!
When a Scale function is activated (by holding down 'Shift' and pressing one of the Scale
keys), this can have a peculiar effect on your arpeggio: any 'outside notes' you play
that don't belong to the currently selected scale will be forced (quantized) into it, causing
duplicate notes. If, for example, you've set Scale to C major and you play a block or legato
chord including an E and an Eb (which is foreign to the C major scale) the arpeggio will play
the E twice in swift succession, which causes a ratcheting effect.
Arturia - User Manual Keystep Pro - Making Tracks 67