Scarlatti used the baroque trill symbol and tr, for brief tremulo, apparently interchangeably as a general sign for a note to be stressed. When he wanted a continuous trill, he seems always to have written the word tremulo out in full. Since modern players are accustomed to play trills in the later classical manner, I have used the baroque symbol throughout. So, an editor cannot pre-choose their performance. Players who wish performance examples are referred to my recordings .
Accidentals here follow modern usage - an accidental continues until the end of the bar.
Scarlatti normally used a flat to cancel a key signature sharp, but a natural to cancel a key signature flat. Sometimes, a natural was used to cancel an accidental preceding it in the bar, but usually accidentals were written on each affected note and did not apply to other notes. However, when space was tight, and it was considered obvious to a player of the time what the proper pitch was, accidentals were omitted. I have used my best judgement to interpret ambiguous cases. For the sonatas apparently intended for violin and continuo, I have provided a realization suitable for my violin and harpsichord playing.