You brought back some memories there Allan !! The 6100 was my first keyboard and it was well ahead of its time. The only problem I found with it was the Tempo Control slider - it was difficult to select a precise tempo because of its very short travel.
I modified my 6100 and another 3 belonging to friends, by fitting a 10 turn potentiometer to the Right hand front of the housing and disconnecting the original slider.... Made a great difference to the Tempo setting ability.
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)