Guess what...
I took an old PC keyboard cable (Din 5 180ยบ connector) and connected two wires to a mono audio jack. Then I downloaded a couple of games in mp3 format from http://www.amstradeus.com (http://www.amstradeus.com) into my iPod, I put the 6128 in tape mode and I pressed the play button.
It worked! ;D
Super fast and with no read errors, hehe.
I'm thinking in connecting a second jack for the data out line of the cassette connector so you can save directly from the CPC to a wav file in your computer...
Hahaha that is ace! Useless, but the cool factor is high :D Why not post some pics?