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The term "audio sequencer" or "audio sequencing" seems to be not clearly defined.
Music sequencer, a class of device or music software to record, edit, and play back the music, by handling musical notes and performance information in various forms
Several people tend to use the term "audio sequencer" to refer several kind of "music sequencer" (see external link 1). However, their definition seems unclear (see external link 2).
References
Audio sequencer Wikipedia(Text) CC BY-SA