The other two black wires might be speaker... probably, the speaker & wires should be inside of the CT1, but maybe somebody has modified it, moved them outside, and cut the connections...?)
== User Manual ==
* [[Media:MP-3 and CT-1 Manual.pdf|MP-3 and CT-1 Manual]] (pdf) (english, french, spanish, german, vlaams)
== Service Manual ==
* [http://www.cpcwiki.eu/manuals/Amendment%20Service%20Manual.rar Amstrad CPC464-6128-GT65-CTM644-MP3-CT1 Amendment Service Manual] (pdf) (the '''CT1 parts list, schematic, component map''' are found on the last some pages)