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The SIDKick pico ("SKpico") is a drop-in replacement for the SID 6581/8580 sound chips in the Commodore 64 and 128 computers, and it can also emulate the SFX Sound Expander (FM). It has been designed as an inexpensive alternative to other replacements while not making compromises regarding quality. In its original form, it consists of a simple interface board and a Raspberry Pi Pico (or compatible clone). 

• dual 6581 and/or 8580 emulation based on reSID (optional: extension for digi-playing techniques), or 6581/8580 plus FM emulation
• 2nd-SID address at $d400, $d420, $d500, $d420 + $d500 simultaneously, $de00, $df00 (on C128 no $d500), or any address when an external chip select signal is used (e.g. on Ultimate 64 boards)
• paddle/mouse support
• built-in configuration menu (launch with "SYS 54301"/"SYS 54333", also from C128-mode)
• built-in PRG launcher ("SYS 54333,0" etc. or from the menu), PRGs can be integrated into the firmware or flashed from the configuration 

All info can be found on this github-page: https://github.com/frntc/SIDKick-pico