Hi Alan.
I do it by passing the ?VoiceNumber from the outer replication through a script to the inner replication.
For example :
A script just before the inner replication would contain the following:
(inputs at: 1) start: 0 s
outerVoiceNumber: ?VoiceNumber
Also specify ?outerVoiceNumber to be excluded from being renamed list (i.e. SpecialEvents) in the contsructor of the inner replication
and then refer to outerVoiceNumber inside the inner replication