Firmware updates and fixes for the new Directstream MK2

[jkrichards]

Thanks Ted.
#8

Ted Smith opens up and tells all

I was referring to the attenuator switches being noisy. Before we knew that they were noisy and that that noise was there even if when the attenuators weren’t being used I was trying to balance things like THD, noise, … when tuning the SDM. Now that we know the source of the noise and have removed it from the units sent to the field I can retune the SDM to lower THD a little. No units were shipped with the bad attenuator switches.