You can invoke Audio Tool in several ways:
from the desktop menu by choosing Workspace -> Programs -> Audio Tool...
from the Mail Tool by choosing Attach -> Voice... from the Compose window
from an audio file attachment to a mail message by double-clicking SELECT on the audio file glyph
from the File Manager by double-clicking SELECT on an audio file glyph
from the command line with the audiotool command
Refer to the audiotool(1) manual page for information about the Audio Tool command's syntax.