Soooo funny to assemble. I changed some LEDs and it looks like acoustic VU meter. Blue, green, orange and red in every row.
Fast delivery._
Works as described, replaced microphone amplifier 1st stage S9013 transistor with BC547B and got it super sensitive. Also last transistors are not going fully on-state so 560R resistor can be replaced with 100R resistor to balance light output._