Luc,

I think the sign you are referring to is called a fermata (or 'pause' in English). The appoggiatura has a different function and is a way of notating non-harmonic tones. Appoggiaturas were commonly used in Mozart's day.

A fermata is added to a note and it means to lengthen or hold the note as long as one feels that it is musically justified. (See the image at the end of this post and the sign over the note 'A' on the right of the image.)

BIAB does not have this sign in it's notation repertoire. If you want this, try using MuseScore. It's an excellent freeware notation program. BIAB's notation is designed for quick and easy leadsheets and it does this very well. It is not comprehensive music notation software. (The marking could easily be added using a black pen to a BIAB printout.)

https://musescore.org/

To play the effect of a fermata, use a 'Hold' chord as recommended by chulaivet1966 above and (possibly) reduce the tempo for that particular bar to obtain a 'pause' feeling. If you do change the tempo, you will need to use F5 to reset the tempo in the following bar.

Regards,
Noel

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