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CLOCKWORKS FOR MAC OS 9

Sending patch changes from the Mac

As you can see by the serial port options in the Set Trigger

Source dialog box, your Express interface can receive

patch changes from software running on the Macintosh.

You should be careful, however, when choosing to do so

because you can inadvertently switch the current preset.

For example, you might have a patch change event in a

sequencer track that you intended to call up a patch on a

sound module. But if the patch number is the same as your

Express interface preset, your Express interface will

respond to it as well.

To avoid this problem, you can use system exclusive data

instead of patch change events to make Express interface

preset changes from the computer. Your Express interface

has a “preset selection” system exclusive message, which

you can program into your sequencer instead of a patch

change.

Your Express interface preset select message is as follows:

F0 00 00 33 08 22 00 00 xx F7

The “xx” byte speciﬁes the preset number. Use the value

shown in the table below. For example, to select the Live

Keyboards preset, plug in “0B” in the message to get:

F0 00 00 33 08 22 00 00 0B F7

When you send this message to your Express interface, it

will switch to the Live Keyboards preset.

Preset Hex number (“xx”)

Sequencer 30 fps 09

Sequencer 25 fps 0A

Live Keyboards 0B

Merge All 0C

Merge Some 0D

Dual Split 0E

MIDI Machine 0F

Direct 10

User Preset 1 01

User Preset 2 02