![]() The dual keyboard design is illustrated below and was accessed through the use of a switch mechanism to provide independent access for the performers thumb onto Keyboard #2 and the performer's remaining fingers This provided the soloist with a total range of tones which exceeded three and one half octaves. It incorporated dual keyboards for the soloists' left hand based upon two sets of reeds which were tuned in octaves. designed and built a working model of a free-bass system to assist in the performance of both classical and symphonic jazz compositions in 1940. In the United States, the virtuoso John Serry Sr. From 1906 the brothers Kiselevs' factory in Tula began to produce bayans with the three-row free-bass left keyboard. In 1900 in Moscow Russian master Bakanov made a garmon with piano keyboards for both right and left hands each w/ 30 Keys from C to F. The problem was solved in the early 1900s by adding three rows of chromatically ordered single notes next to the standard bass. However, while that setup worked well for major and minor music accompanied by many chords, the performer would only have access to about a major seventh of bass notes while playing, or two octaves with a timely shift of registers. ![]() By the year 1900, the Stradella bass system had principally reached its current construction with 120 buttons over six rows. ![]()
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