Keyboard scanner hints

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In a message dated 98-12-25 18:29:30 EST, synth1 at airmail.net writes:

<< I built a monophonic keyboard with low-note priority (ie Moog) using this
 scheme.   >> 

 Hello,
  I was wondering if it is possible (without too much modification) to convert
a poly synth like the Oberheim OBXa (in unison mode) or a mono Moog Source to
respond to high or last note priority instead of low note priority.
 I'm more accustomed to either last-note or high note triggering schemes and
would be interested in changing this aspect of these two synths. Is this a
difficult thing to do?
 Thank you very much for any input you may give.

 Happy holidays,
 Andrew Sanchez