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Ports

Device Port Connected to
ESP D0 NFC: SDA
ESP D1 MCP: SCK (12)
ESP D2 MCP: SDA (13)
ESP D3 --free--
ESP D4 --free--
ESP D5 SCK
ESP D6 MISO
ESP D7 MOSI
ESP D8 MP3: XCS
MCP B7 MP3: XRESET
MCP B6 AMP1: SD
MCP B5 AMP2: SD
MCP B4 MP3: XDCS
MCP B3 MP3: CS
MCP B2 MP3: DREQ
MCP A0 BTN_PREV
MCP A1 BTN_VOL_UP
MCP A2 BTN_VOL_DOWN
MCP A3 BTN_NEXT

Buttons pull to GND if pushed -> Internal Pull-Up needed!