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Sounds like the batteries weakened in the course of recording. The machine slows down and, when played back at a uniform speed, speeds up. Steve Smolian -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Grant, Tyra Sent: Friday, February 26, 2016 11:43 AM To: [log in to unmask] Subject: [ARSCLIST] Cassettes that speed-up---what's up? We're transferring a collection of personal cassettes---interviews---mainly from the 90s. A few start out okay then slowly speed-up so people sound like The Chipmunks. Then, some are okay on one side but the flip side is speeded-up. What's up here? We'd appreciate recommendations re: the best way to handle these in order to get something listenable. Thanks, Tyra Grant [log in to unmask] 785-864-2034 University of Kansas Libraries