Thanks for the reply - “Microphone 4 cannot be used since it is non-line of sight to the shooter for shots 1-3” . . . but I respectfully do not agree.
The Source 4 audio (when the shots were fired) has line-off sight to the south facing second floor AGR BLD2 windows - very few positions will have line of site to the shooter rifles positioned inside the rooms behind the open windows - and Source 4 does not have line-off sight to Crooks - but the latter audio still provides useful examinable data (I think).
Anyway - when I working-up Source 2 comparative audio data (using the indicated approach) it provides results that at a minimum are directionally qualitatively consistent with the indicated 4-shooter hypothesis - and seem to be quantitatively consistent in view of measurement errors etc. If I get a better audio track plot for Source 2 that has the reference time-bar - I will go back and do fresh top-down look - work-up and post findings for the comparative analysis for both sources.
Once you see it - you will not be able to unsee it! But you don’t have to wait for me.