converts various signals to 1-sample impulses.

signal input: signal to analyse
sync output: sends the signal impulse output to this channel
trigger: what will trigger it, thresh =  when the audio input exceeds 'value' (below), diff =  the difference between the currend audio sample and the previous exceeds 'value'
mode: impulse = send a one sample long impuse, state = switch between on/off (gate)
value: the threshold, or difference needed to 'react'
hold: (not used)