I can't say for a MK-IV, but I had a MK-IV and now a DKC-850 and they both play commercial music CD's with sound through the piano speakers.
Roger
On Jul 14, 2016 5:42 PM, "charleslau@prodigy.net [disklavier]" <disklavier@yahoogroups.com> wrote:
I Have Mark-IV Disklavier can I playback a regular CD disk in the CD drive producing sound output through piano speakers? I'm not asking if the CD can reproduce music through the Yamaha digital piano system which I know it can't do that.