librubberband-dev 3.2.1+dfsg-6 (s390x binary) in ubuntu mantic

 Rubber Band is a library and utility program that permits you to
 change the tempo and pitch of an audio recording independently of one
 another.
 .
 This package contains development files for linking against
 librubberband, along with the static version of the library. API
 documentation is available at
 https://www.breakfastquay.com/rubberband/code-doc/ .