15
The range over which the sensor is sensitive is pre-set to about 3” – 40” (8 cm - 100 cm). You can alter
this by hacking the open-source software. See “Programming the Altura” below. Holding your hand
closer than the minimum distance can confuse the sensor and produce unexpected behavior.
Using the OCTAvE NEAR and OCTAvE FAR knobs, you can control how many octaves are active (from
one to eight), and whether the scale is ascending or descending. See “10, 11. Octave Near and
Octave Far Select” on page 22.
You can set the key and scale in which the Altura MkII will play. See “11. Key (Root Note) Select” on
page 20, and “12. Scale (Mode) Select” on page 21.
You can set how sensitive, or responsive, the right sensor is with a feature we call Articulation. See
“Articulation Adjust” on page 24.
In Function 6 - X-Y Mode, the right sensor emulates the left sensor and transmits user-defined control
change data. See “Function 6: X-Y Mode” on page 18.
5, 6. DATA FAR AND NEAR SELECT
The DATA knobs have slightly different functions depending on the FUNCTION knob setting. These
behaviors are summarized in this section, but please see the respective Function sections below for
more details.
Function 1 (Pitch Bend): The DATA FAR knob controls the size of what we call the Neutral Zone, where
the pitch remains unbent. The DATA NEAR knob sets the maximum semitones of bend when used with
a Macchiato Mini Synth.
Functions 2 – 6: The left sensor behaves much like the Data slider found on most MIDI controllers. Use
the DATA knobs to set the maximum and minimum values produced by the slider. DATA NEAR sets the
limiting value the Altura MkII will transmit when your hand is near the sensor – any value from 0 – 127.
DATA FAR sets the limiting value far from the sensor, also any value from 0 – 127. By swapping values,
you can make the Altura MkII transmit values that either ascend or descend. Adjusting the DATA knobs
does not cause any Controller message to be transmitted. Only waving your hand in front of the sensor
will trigger a MIDI message.
Function 7 (Channel Select): The DATA FAR knob sets the MIDI Send channel. The DATA NEAR knob
has no function.
Function 8 (Arpeggiator): While in theremin, or Arpeggio Play (“
THR
”) mode, these two knobs have no
function. In Arpeggio Setup (“
ARP
”) mode, all seven knobs are used to define the arpeggio.
When you use the left sensor to send a MIDI control change message, that control value will “stick”
even when you change functions. For example, you might wave your hand to set Modulation = 30 and
then change to Function 5 to work with Portamento effects. The Modulation effect will remain active at
value 30. However, when you return to Function 2 – Modulation, the old values of Modulation Near
and Far will be overwritten by the current knob positions. You will continue to hear modulation at value
30 until you use your left hand to change it, but the Near and Far limiting values may have changed!
Be aware of this behavior in a live performance situation.
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