Selector class public functions

Additional functions inherited from Filter.

Selector(int selector);
Sets the read channel in input[0] to be selector, i.e., input[0].output(channel); will be called for Selector.output(0).
void action(void);
Does nothing.
double getChannel(void);
Returns the channel.
sampleType output(int index);
Returns input[0].output(channel).
void setChannel(double aChannel);
Sets the read channel to aChannel.