PlayCity is:
- 6 audio channels with programmable clock. (CPC, ZX, ST, ...)
- 4 counter/timer for programmable interrupt. (including NMI)
- IM2 vectorized and raster lines interrupt.
- CRTC hardware CURSOR support.
- 16bit general purpose Timer.
- Light pen/gun connector.

Preorder this board.
PlayCity / 2014 ACME

Note, about Amstrad PLUS: 
No speaker mixing through the monitor. You have to use extra external speakers plugged to the PlayCity stereo jack.