E-Mu Ultraproteus Operation Manual page 301

SYSEX TUTORIAL
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.
280
HOW TO EDIT A MIDIMAP PARAMETER
We'll offer one more example by popular request. Editing a Midimap is just
another type of parameter data editing. The number given for the parameters is
an OFFSET which will be added to the base number for MidiMap given on page
276. The format for parameter editing is the same as always.
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 Amount of FX A to 50%.
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 Midimap parameter number for FXA Amount in
Hexadecimal. This will be the Parameter Number portion of the message.
The Midimap offset numbers shown on pages 258-259 must be added to the
base offset in order to get the actual parameter number.
3) The Midimap parameter list shows FXA Amount as 355 (page 259). The base
offset number for Midimap parameters is 2048 (page 276). Add these num-
bers to get the actual parameter number. 2048 + 355 = 2403.
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) 2403 ÷ 128 = 18 r99
b) 18 in Hex = 12 = msb
c) 99 in Hex = 63 = lsb
5) The least significant byte is always sent first. The MIDI SysEx string now
looks like this: F0 18 0C 00 03 63 12 XX XX F7. We're still missing the
value data to set the Amount.
6) From the table on page 259 we see that the FXA Amount range is 0-100%.
Simply send the desired amount in Hexadecimal. 50 in Hex = 32, or 00 32.
7) The completed message is (lsb first): F0 18 0C 00 03 63 12 32 00 F7.
UltraProteus Operation Manual
(usually 00)
(from Command Summary)