There is a C.D. recorder made by Marantz/Superscope that has a couple of features --both changing speed with out changing pitch...and also changing the key/pitch--great for music practicing purposes.... here is one of their units.....only items i see seem to be used ones, perhaps they are not in production at this time.... http://www.fdwcorp.com/common/files/424-PAC770750Brochure.pdf    the units i was thinking of are these...one of which i have... Superscope products, such as the PSD230 and PSD340, became very popular with K-12 schools, Colleges and Universities, as well as with students and professional musicians alike......and here is the most recent iteration: In 2014, Superscope introduced the PSD450mkII, Superscope's most advanced and easy-to-use portable digital audio recorder to date. The mkII can be found in recording applications in music, business, government, education, and wherever high-quality audio recording is required. (again, not a free app or digital program, but these units do exist....