Apple Logic Express 7 - Manual (Page 130)

130 Chapter 19 EXSP24
You have the option of inserting another modulation source in the middle slot labeled
via. In this scenario, the green triangular fader will divide, allowing you to set a range
for modulation depth. The size of the modulation range depends on the possible
values allowed by the via modulation source.
In our example, the key number of the MIDI keyboard (Key) determines how strongly
channel pressure controls the Speed of LFO1. More experienced users would read the
picture like this: pressure to LFO1 Speed via key number.
Inverting Sources
You can also invert the direction of the source’s effect on modulation depth by clicking
the inv button (right of the word Src or via), depending on which of the sources you
would like to invert.
In this example, we inverted the via modulation source. You can see how the green and
orange triangles have swapped positions. The orange triangle always marks the
modulation depth for the maximum value of the via source, while the green triangle
always marks the modulation depth if the via source is at its minimum value. They are
reversed by inverting the modulation.
Bypassing Modulation Paths
You can temporarily disable the entire modulation path with the b/p button, found
alongside the word Dest.
In our example, both modulation sources—Pressure and Key—are disconnected from
the LFO1 Speed modulation destination. Clicking the b/p button a second time
reconnects the modulation path, restoring the old modulation depth settings.