Hi Bill
Arranger keyboards developed from electronic organs, and are essentially single manual versions of these.
Workstations developed from synthesisers and therefore require more user input
However with modern technology the lines between the 2 are now blurring
You can find details of the instruments you mention from the links below.

http://www.organfax.co.uk/instruments/wersi/pegasus.html http://achamilton.co.uk/Technics/KN6000.htm

Hope this helps

Bill


[This message has been edited by abacus (edited 01-13-2007).]