Those are soo cool.....i built one once...it was because all the little idiot rockers thought that once they layed down a decent track they were now qualified to be producers.....so, Large knob...small knob, old vu meter,set of colorful leds,battery,1 pot......"yeah when ya turn up this knob,ya hear the tone go really cool.....ya hear that dont cha....dont cha?....HEY KID!! PayATTENTION!!"...
producers desk........my partner and I would laugh for hours....surprising how many liked to watch those leds go red and then start nodding to the "NEW IMPROVED SOUND!!!".....