In final revision it obtains standard plastic case, compact speakers with neodymium magnets and li-ion with USB charging.
So, the main idea was in collecting all button controlled IC's from early 2000s and compile somewhat from them. At first I taken a very popular chinese FM radio RDA5807FP, which may be tuned by buttons (switching between autonomous and I2C mode made by pulling up pin 6). Then there was an 6 preset equalizer PT2389, what can be found on PC speaker systems. Class D PAM series power amplifier PAM8406 will get almost 2 watts output power, while powered by step up 5V converter of TP4333 power bank controller. Visual features was loudness level indicator, made from quad op amp LM324 and flashlight, built in TP IC.
Usage: On the right top corner there is on-off switch. In bottom there are 9 buttons: three for sound effects, 5 to radio volume and tune and the last is the flashlight switch. Two windows, covered by foam tape are hides eq and level indicator leds.