Well informed sources point me that "Jet Pack Attack" (which of course received this name only in 2013) wasn't composed specifically for Amiga Turrican: Huelsbeck homages himself by using his own composition for
X-Out, stage 5.
You can hear it, starting from minute 11:35:
https://www.youtube.com/watch?v=WeEmfFdyLlM
I took the liberty to add this info in the album's notes. (also in the Turrican OSV)