Below is a french do it yourself project for connecting a [[SP0256 ]] speech chip to a printer port, using Data, Strobe=ALD, and Busy=Status.
It isn't actually a CPC project (for the CPC one would need to replace LPRINT by PRINT #8), aside from that, it should be compatible with the CPC printer port (the CPC's GNDed D7 printer bit is no problem, since allophone numbers are only 6bit wide).