Writing a comment
You can write a comment on a track through the text box below the waveform that says ‘Write a comment...’ and press your return or enter key to send. You can also mention another user by adding @ before their Profile URL.
The comment will appear at the point on the waveform where you first started typing. Alternatively, you can click any free space in the comment section to leave a comment at that specific point.
Replying to a comment
To reply to a comment you are viewing, click the user avatar on the waveform, or click ‘Reply’ next to the comment on the Track page. To cancel, click anywhere outside of the current waveform. You can visit a commenter's profile by clicking their Display Name.
You can also reply to comments made on your tracks through the SoundCloud app. Click on a comment that was made on your track, and you can reply while you are on the go.