You can trim the beginning or ending of a voice memo to eliminate unwanted pauses or noise.
On the Voice Memos screen, tap
next to the memo you want to trim.
Tap Trim Memo.
Using the time markers as a guide, drag the edges of the audio region to adjust the beginning and end of the voice memo. To preview your edit, tap
.

Tap Trim Voice Memo.
IMPORTANT: Edits you make to voice memos can’t be undone.