Needs the WAV Player application compiled into firmware. Original code from Zlo and most files provided by RogueMaster.

Create a wav_player folder in the root of your SD card. You'll need 8-bit, 2 channel, unsigned WAV files (try Audacity for conversion.)

WAV Player is very particular about the format. WavPlayer needs BitExact, NO headers, 48k PCM, unsigned, 2 channel, 8-bit stereo. Example:

Input #0, wav, from '.\rickroll.wav':
Duration: 00:02:03.38, bitrate: 768 kb/s
Stream #0:0: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 48000 Hz, stereo, u8, 768 kb/s

To produce a compatible file, you can also use FFmpeg:
ffmpeg -i .\input.mp3 -c:a pcm_u8 -fflags +bitexact -flags:a +bitexact -ac 2 -ar 48k output.wav

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I've had so many asking for me to add this.

BTC: 3AWgaL3FxquakP15ZVDxr8q8xVTc5Q75dS
ETH: 0x0f0003fCB0bD9355Ad7B124c30b9F3D860D5E191

So, here it is. All donations of any size are humbly appreciated.

Donations will be used for hardware (and maybe caffine) to further testing!