E-Mu Ultraproteus Operation Manual page 299

SYSEX TUTORIAL
SEE MIDI MODE IN THE MASTER
MENU FOR ADDITIONAL
INFORMATION ON DEVICE ID.
IN ALL OF THESE EXAMPLES, THE
PROCESS OF HEXADECIMAL
CONVERSION HAS BEEN
OMITTED. USE A TABLE OR A HEX
CALCULATOR TO CONVERT
DECIMAL NUMBERS TO
HEXADECIMAL.
278
HOW TO EDIT AN INDIVIDUAL PRESET PARAMETER
Parameter data editing is accomplished using the format described on page 259.
F0 System Exclusive Status Byte
18 E-mu Mfg. ID
0C Ultra Product ID Byte
dd Device ID 0-15
03 Command ID - Parameter Data
pl Parameter Number ls byte
pm Parameter Number ms byte
vl Parameter Value ls byte
vm Parameter Value ms byte
F7 EOX
Example: Change the waveshape of LFO 1 to Random.
1) Find the command ID for the operation you wish to perform from the
Command Summary on page 252 (03 = Parameter Data).
2) Next, we need to find the preset parameter number for LFO 1 waveshape in
Hexadecimal. This will be the Parameter Number portion of the message.
The preset parameter numbers shown on pages 254-256 must be added to the
base offsets in order to get the actual parameter number.
3) The preset parameter list shows LFO 1 waveshape as 93 (page 254). The base
offset number for preset parameters is 8192 (page 276). Add these numbers
to get the actual parameter number. 8192 + 93 = 8285.
4) Now the parameter number must be converted into 14-bit 2's complement in
order to fit into the MIDI format. The instructions are given on the previous
page, but we will go through the process again.
a) 8285 ÷ 128 = 64 r93
b) 64 in Hex = 40 = msb
c) 93 in Hex = 5D = lsb
5) The least significant byte is always sent first. The MIDI SysEx string now
looks like this: F0 18 0C 00 03 5D 40 XX XX F7. We're still missing the
value data to select the desired waveform.
6) From the table on page 254 you can find out that "0" corresponds to the
random wave. Zero is the easiest number to convert. 0 in 14-bit 2's comple-
ment is still 0, or more strictly speaking 00 00.
7) The completed message is: F0 18 0C 00 03 5D 40 00 00 F7.
8) If we wanted to change the waveform to Square, the message would be:
F0 18 0C 00 03 5D 40 04 00 F7. Substitute 04 00 for 00 00 in the data
bytes (lsb first).
UltraProteus Operation Manual
(usually 00)
(from Command Summary)