classic sample&hold: the input is “sampled” (held) and output whenever a new gate
or trigger signal is present at the Gate or Trig input. Threshold: determines the
threshold level of the Trig input. If Gate/Trig knob is lit -> trigger input is active.
Similar to sample&hold. Input value is stored and will be output when a trig signal
is received, first at out1, on next trigger on out2 and so on.