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To sum or not to sum

Hi guys...I have a very basic question.
What would be the difference between
*sending all my digital outputs into 1 stereo output- to a high quality preamp and sending it back to the A/D converter

and

*sending all my digital outputs into a summing mixer and then into a stereo preamp and sending it back to the A/D converter

thanks!
noam,

jv1080 bulk dump check sum error

I've got a Roland JV 1080 and recently for the the first time ever I got the message "Check Sum Error" when trying to reload a bulk dump I'd saved in my sequencer (Logic). The synth didn't respond to anything - it just kept flashing the message "Check SUm Error" so I eventually switched it off. Then when I switched it on again, the sounds were very strange i.e.