Martin LIGHTING DIRECTOR User Manual download pdf (Page 73)

DYNAMIC CONTROL EXAMPLE

Suppose what you wanted was for the performer to control the volume of MIDI

channel 12 so that as he or she raised and lowered his or her arms the volume would

increase and decrease accordingly. Again, the first thing to do is to click on the MIDI

enabled box and look for the MIDI channel volume control command, which is:

Bx yy zz

where x is the channel number minus one from $0 to $F (decimal 0 to 15), yy is the

control number from $00 to $79 (decimal 0 to 121) —these are defined by the

manufacturer of the device— and zz is a control value from $00 to $7F (0 to 127

decimal). So:

• you want channel 12 so x is $B (the channel minus one and then converted to

hex),

• you want to specify MIDI channel volume control so look at the instrument’s

controller allocation table in its manual and let’s say it gives yy is $07

• you want dynamic control of the MIDI controller selected so zz does not have a

static value

The final byte boxes would look like this:

Notice that the dynamic control mark (the V hat) has been placed on top of the last

byte box: this is because you want to control it dynamically. The value 7F is just a

placeholder, it could be any other value and still have no effect. So up to now you have

specified what you want to be controlled dynamically and, as with lighting, you must

define how you want that parameter to vary by drawing a media behaviour curve. For

this example click on the floor - ceiling axis of the blue cube on the bottom of the layer

media screen. Now draw a curve or line so that when the tracker is on the floor the

value for zz will be 0 and when the tracker is at about 2 metres above the floor the

value of zz will be 127. Note that the layer media behaviour curves are in decimal

values and that MIDI controllers typically may have values between 0 and 127, higher

values are reserved for MIDI command definitions.

Side note: in this example we assume that there is already a note playing on channel 12.

MLD manual 1.1 Page 73

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Martin LIGHTING DIRECTOR User Manual Page 73