Hi Jim,
Sorry, I forgot to mention how these actually fired.
Most of these organ guns simply had a common powder line applied connecting all the touch holes and would then fire simultaneously.
Regarding the interestig parallel you noted on English 18th c. flintlock pistols, I assume you are referring to the duck's foot type with usually four or five diverging barrels; they too were set blazing at the same time by a centrally boxed flintlock mechanism and corresponding touch holes.
Best wishes als always,
Michael
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