Making Records with the Gakken Toy Record Maker on CD-R Disks

I have tested the Gakken Toy Record Maker with a Sewing Needle mounted on Top of the Original Needle and put some Weights with Magnets on the Speaker. And cutting Records on Blank Side of CD-R Disks. It worked but the Sound is quitly and there are no high Frequencys. But to my Surpise the Disk is playing on a Regular Record Player too!