

This is an interactive assistant, that will ask you to play these
holes of your harmonica, key of <%=$key%>, one after the other:

  <%="\e[32m#{holes.join(' ')}\e[0m"%>

Any existing recording will be presented first for review. Then you
may start a new recording and trim it (cut of initial silence). This
will be repeated for all holes.

After all holes have been recorded, a table of all frequencies will be
printed, so that you may do a final check of your recordings.

You may invoke this assistant again at any later time, just to review
your recorded notes and maybe correct some of them.  Results are
written to disk immediately, so you may end the process after any
hole. To start from a specific hole, use option '--hole'.

The harp, that you are going to use for calbration, should be the one,
that you will use for your practice later.

The recorded samples will be used to determine the frequencies of your
particular instrument and will be played back in mode 'quiz'.

