Small Guitar Amp with Arduino Gate/Tremolo Effect

Small, portable guitar amp in a cardboard box. Two speakers each driven by separate LM386 modules, for some fuzzy, messy distortion. An Arduino Nano cycles power to the two modules, creating a gated/tremolo type of effect. Powered by 4 AA batteries. Size is 8.5“x3“x4“. Sloppy speaker holes courtesy yours truly and an X-acto knife. The two yellow knobs control the speed of the effect: Top knob controls how long the power is off, bottom knob controls how long power is on. All the way down on both knobs = no