Aphex Systems 1788a - page 12

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R/C Manual 2. USING MIDI
additional 1788A is used, the second set of eight faders and buttons of the PC1600 could
be coded exactly like the previous tables, except with the channel and/or device number
changed to match the second 1788A. Remember, in this case, NET number is just a
placeholder and can be anything.
2.1.8 Broad Commands & Presets
It is possible to send many commands within a single SysEx string. This is more efficient than
sending many 11-byte SysEx strings in sequence. By looking at the SysEx string illustration
of figure 2-3, you’ll notice a grayed out area comprising the command, mic channel and
value bytes. By simply repeating these three bytes containing additional commands, mic
channels and values, you can cause the same 1788A to update every function in all mic
channels or any combination. This could be considered a preset “done the hard way”.
Limitation:
You can also use this way to send a single fader or button to multiple mic channels of
the same 1788A. The only limitation is that you can have only one MIDI channel and one
device number per SysEx string. Therefore, this technique can create a preset or broad
command for a single 1788A but not multiple 1788A’s.
NOTE: To effect a massive update of multiple 1788A’s, you’ll need to create a SysEx
string for each unit. They can be concatenated (spliced together end-to-end) to make
one very long string or sent separately.
2.1.9 Learning a Preset
Many MIDI controllers have a Learn mode. This can help you speed up the process of
writing a long SysEx string to use as a preset. 1788A’s have a secondary function that
will send a SysEx dump to the MIDI Out port in the form of a properly formatted string.
Simply place your MIDI controller in Learn Mode, and while it is waiting for a signal, press
both Tone buttons and the Channel 5 button, then release. A SysEx packet containing
every parametric value in the 1788A will be sent. No labels or other superfluous data will
be included. This SysEx string will be learned as the output string for the chosen MIDI
controller’s pushbutton.
You will have to edit the SysEx string to put in the 1788A’s correct MIDI channel and
device bytes, since the numbers that were learned would have been the I.D. of the MIDI
controller itself. Once this is done, you can rapidly return the 1788A to these parameters
just by pushing the MIDI controller button. To implement multiple 1788A’s, you will need
to learn the string from each 1788A into a separate MIDI controller button. To recall a
preset across several 1788A’s, you would press several buttons.
F0 00 00 38 xx xx xx xx xx F7
SysEx Start
MIDI Channel MIDI Device
xx
Net Number Command Mic Channel Value
xx xx xx
Command Mic Channel Value
xx xx xx
Command Mic Channel Value
SysEx End
Put Up To 64 3-byte Commands Here
Aphex MIDI I.D.
Fig. 2-4. Broadening the Command String