Unfortunately, only the power or loudspeaker is connected. What do you think about it? In my opinion, there is a short circuit or bad assembly because after connecting the power supply, the gate / trig switch diode shines constantly. In the movies on YouTube I saw that the diode pulses after pressing a key and goes off when I do not touch the keyboard. For me it lights up all the time after turning on the power and selecting the generator with a slide potentiometer. What do you think about this?