M-Audio Oxygen Series User Manual

Oxygen Series User Guide  6
16,384 step resolution through combined Coarse and Fine messages
Most assignable MIDI controls, including those on your Oxygen series keyboard, operate with a resolution of 128
steps. Standard MIDI CC messages that can be used universally between different MIDI devices are also limited to
a resolution of 128 steps. However, the RPN/NRPN concept allows for a resolution of 16,384 steps by combining
two 7-bit MIDI messages into a 14-bit message (coarse + fine).
Hardware controller knobs or sliders that take advantage of the full 14-bit RPN/NRPN resolution are very
uncommon. To illustrate the concept and make the purpose of RPN/NRPN Coarse and Fine messages easier to
understand, we included a graphic describing how such a 14-bit RPN/NRPN control would operate (not supported
by Oxygen Series keyboards):
The RPN/NRPN coarse message divides the range of 16384 steps into 128 segments and activates them by
sending each segment's first value, while the RPN/NRPN fine message provides the 128 steps of resolution
contained in each of these segments.
Coarse
9
8
7
6
5
4
3
2
1
0
16,384
127
9
8
7
6
5
4
3
2
1
0
127
9
8
7
6
5
4
3
2
1
0
127
3
9
8
7
6
6
5
5
5
5
4
4
4
4
3
3
3
9
8
7
6
6
5
5
5
5
4
4
4
4
3
3
9
8
7
6
6
5
5
5
5
4
4
4
4
3
3
1
2
0
Fine
Fine
Fine
16,384
0

M-Audio Oxygen Series Specifications

General

Velocity-sensitive keys	Yes
Pitch bend and modulation wheels	Yes
Octave up/down buttons	Yes
Assignable knobs, sliders, and buttons	Yes
Connectivity	USB
Keyboard	25, 49, or 61 keys depending on model
Power source	USB
DAW Compatibility	Ableton Live, Logic Pro, Pro Tools, FL Studio, Cubase
Features	Arpeggiator
Compatibility	Windows, macOS
Included software	Pro Tools First
Type	MIDI controller keyboard