Hello, Tyra -
The original was probably recorded on a battery operated cassette
machine. Batteries wear out, recording speed slows down, content speeds
up when tape is played on an AC powered machine. Voila!
Malcolm

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On 2/26/2016 6:42 AM, Grant, Tyra wrote:
> 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
>