Great topic!
I guess as with any spec on an arranger, us arranger players have been adapting to what ever the manufactures throw at us.
I mean 76 keys would make life much easier for an OMB entertainer. It is a compromise between 61 and 88 keys. A 76 key arranger would eliminate the need to constantly having to press the octave up or down button to get a few extra notes. Also, if your keyboard allows for 2 or 3 right hand splits, you can do that so you have 2 sounds in the right hand. 76 keys will give you more room to play with when playing chords in the left hand in arranger mode. Playing full piano mode or with left hand bass is more inspiring and easier with a 76 keyboard.
A 76 key keyboard gives the player more flexibility and reduces the number of button presses one would have to do while playing a song.
But compromising is what we do as OMB entertainers. Since the manufacturers throw at us 61 keys we have to adapt to it. We would do the same if it were 49 keys.
76 keys is the ideal OMB arranger keyboard.
[This message has been edited by to the genesys (edited 09-17-2006).]
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TTG