I cant offer any such tut, but it is about clone and rename action in the current cfg file. I did that way a soundset for propeller and jet four engined airplanes. See at
http://simhangar.nolimit.cz for Me 264 or Horten XVIII. There are links to SOH threads and download.
EDIT: a link to the downloadable sample of the Me 246 4-engined propeller sound config, derived from stock Ju-88, below. you can compare it with the dafult 2-engined Ju-88 source.
http://www.sim-outhouse.com/sohforu...S3-(flyable)?p=1065731&viewfull=1#post1065731
notes: the Horten use 2x 2-engined config base:
[SOUND_ENGINE]
number_of_engines=4
eng1_combustion=COMBUSTION.1.00
eng2_combustion=COMBUSTION.2.00
eng3_combustion=COMBUSTION.1.00
eng4_combustion=COMBUSTION.2.00
eng1_jet_whine=JET_WHINE.1.00
eng2_jet_whine=JET_WHINE.2.00
eng3_jet_whine=JET_WHINE.1.00
eng4_jet_whine=JET_WHINE.2.00
eng1_starter=starterA
eng2_starter=starterB
eng3_starter=starterA
eng4_starter=starterB
eng1_shutdown=shutdownA
eng2_shutdown=shutdownB
eng3_shutdown=shutdownA
eng4_shutdown=shutdownB
eng1_combustion_start=combstartA
eng2_combustion_start=combstartB
eng3_combustion_start=combstartA
eng4_combustion_start=combstartB
the Me 264 use a regular 4 engined config base:
[SOUND_ENGINE]
number_of_engines=4
eng1_combustion=COMBUSTION.1.00
eng2_combustion=COMBUSTION.2.00
eng3_combustion=COMBUSTION.3.00
eng4_combustion=COMBUSTION.4.00
eng1_non_combustion=NON_COMBUSTION.1.00
eng2_non_combustion=NON_COMBUSTION.2.00
eng3_non_combustion=NON_COMBUSTION.3.00
eng4_non_combustion=NON_COMBUSTION.4.00
eng1_prop=PROP.1.00
eng2_prop=PROP.2.00
eng3_prop=PROP.3.00
eng4_prop=PROP.4.00
eng1_starter=starterA
eng2_starter=starterB
eng3_starter=starterC
eng4_starter=starterD
eng1_shutdown=shutdownA
eng2_shutdown=shutdownB
eng3_shutdown=shutdownC
eng4_shutdown=shutdownD
eng1_combustion_start=combstartA
eng2_combustion_start=combstartB
eng3_combustion_start=combstartC
eng4_combustion_start=combstartD
... still in the end you can hear 1-2-3-4 engine startup sequence on both solutions