The sounds are for P3D IIRC. But they can be combined with the original sounds. There are two mods on flightsim.to that kind of mix the original Aerosoft sounds (interiors, switches etc) with TSS engine sounds.
Installation order ist like that:
-
TSS Sounds
simMarket: DHC-6 PT-6 TWIN OTTER HD PILOT EDITION SOUNDPACK FOR FSX -
Aerosoft Twin Otter Soundmod for RPM/Pitch Fix
https://flightsim.to/file/26712/aerosoft-twin-otter-soundmod-for-rpm-pitch-fix -
CCM’s Sound Config mod
https://flightsim.to/file/27542/ccm-s-twotter-tss-sound-config-mod