When I build battery-powered sound effects, I typically use the DFPlayer Mini. It is a tiny MP3 player that plays tracks from a microSD card and includes an amplifier for small speakers. Typical application circuit without a microcontroller (arduino / raspberry pi pico) is ADKEY or IO mode. Wire up a push button to the right pin, and music plays when you push a button.https://wiki.dfrobot.com/dfplayer_mini_sku_dfr0299 But what about autoplay, no button? To make music start as soon power is applied, you can make use of a less documented feature of ADKEY1. If you hardwire wire GND to ADKEY1 (no pushbutton): Track 1 will start playing when power is applied and…