 It had a tuning with 58 pitches in the space of an octave for performing music in just intonation and was championed by John Farey, Sr., who also directed attention to instruments developed for similar purposes by David Loeschman and William Hawkes.Liston used a series of pedals to change the pitch assigned to the keys of an ordinary keyboard, changing sharps and flats, as well as raising or lowering pitches by a major comma as required by the key of the music being performed.The first instrument was built in Edinburgh and had a separate pipe for each pitch.