38 User Guide Oxygen 88
The controls on Oxygen 88 allow assignment of either a RPN/NRPN coarse message, or a RPN/NRPN fine
message, but not both simultaneously. In practical use, this means:
Assigning an RPN/NRPN coarse message to an Oxygen control allows to access values throughout the
entire range of 16384 steps while skipping 128 steps with every value transmitted
(0; 129; 258; 387; 516; 645;...;16384).
Assigning an RPN/NRPN fine message to an Oxygen control allows access to the first 128 values of the
entire range (0-127 of 16384).
In most cases, it is preferable to assign the RNP/NRPN coarse message, unless two Oxygen controls are
dedicated to be operated together for simultaneous control of the RPN/NRPN coarse and fine parameters.
Many data sheets for synthesizers make use of NRPN messages and will give the LSB and MSB values that
should be entered for Data 2 and Data 3. Some manuals may only give the hex values, but Oxygen requires the
decimal value to be entered. See Appendix E for a hex to decimal conversion chart.
SysEx
System Exclusive (SysEx) messages were defined in the MIDI specification to allow control of individual devices via
MIDI. The format of SysEx messages allows virtually any function to be performed via MIDI if the receiving device can
read and translate the message. This allows devices to send audio sample memory data, memory dumps, controller
settings, and much more. It also allows the controllers of one device to be controlled by another.
It is not possible to program your own specific SysEx message into the Oxygen controller. However, several useful
SysEx messages are pre-programmed into the keyboard. They can be accessed by assigning the appropriate MIDI
controller number to a control.
A SysEx message is not transmitted on any specific channel. All SysEx messages contain a Device ID, which is used
to single out devices to respond to the SysEx message. All other devices are ignored. If you are using a SysEx
message with your Oxygen keyboard, the Global Channel is ignored. When you press the Channel Assign key, you will
enter a Device ID instead. This is indicated by the fact that the LED screen displays a 3-digit number, not a 2-digit
number proceeded by a "c."
Device IDs run from 00 to 127. 127 is the default device number setting for Oxygen 88. This setting transmits the SysEx
message to all devices.
It is not possible to program the controls on Oxygen 88 with your own SysEx messages, there are software applications
that can receive a MIDI input signal and translate it into a different, user-specified message. You can program your
custom SysEx messages into the translator software, and then translate the incoming data from the keyboard to your
custom SysEx message.
