On Tue, 2010-01-26 at 15:15 -0500, David McClanahan wrote:
  ... Roland, Korg, Yamaha put out turnkey products on
what I suspect is
 simpler hardware and my question is there any reason why similar
 turnkey systems could not be developed on a Linux system ...
  
There is a difference between 'any Linux system' and 'a Linux System
built for audio'
A Roland/Yamaha styled HW synth will at least have one dedicated DSP -
or even custom built logic - directly connected to its ADC/DAC to do the
single innermost loop that is the RT-application.  Everything else is
for display, blinken-lights and monitoring state of knobs and buttons.
A $150 Beagle Board has the nescessary HW and connectivity to work like
that. Your Dell laptop does not.