1. First steps in Reaktor Core - Native Instruments

The OBC chain at the bottom keeps the previous input signal value. As you can
see the new value is stored after the old one is read. The last Write module
in the chain performs the initialization job for the previous value storage. We
initialize the storage to –1 so that the first positive value will be counted as
a rising edge.
Having a Write module at the end of an OBC chain is another way (as
opposed to Merge) to initialize the storage. It must be the last Write
module in the chain in order to overwrite the results stored by upstream
Write modules.
The Router controlled by the Sign Comparison module will gate the events,
letting through only those where a sign change from negative to positive occurs.
It’s not clear whether such a module will send an event during initialization
or not, particularly because the storage is still zero at the time of initialization
event processing, and the sign of zero is undefined. We can modify this
structure in order to avoid sending an event during the initialization:
The ES Ctl module is an event sensitive control. The control signal produced
by this module is true only if there is an incoming event at the input of this
module. Because this input is disconnected in the above structure, which
means it’s connected to a zero constant, the only time the control signal is
true is at initialization. So the second router will block any event occurring
during initialization and let all others through.
REAKTOR CORE – 117