After a few flights the Twin Otter grows on you and for me the sounds are 90% OK if you fly it 'right'.
But you can easily try other sounds (if you can access aircraft.cfg)
eg for the 300 Wheels Pax find the line in [FLTSIM.0]
Sound="\..\..\AS_Aircraft_DHC6_Common\sound"
and change the AS_Aircraft_DHC6_Common to another aircraft eg the Asobo_KingAir350
Sound="\..\..\Asobo_KingAir350\sound"
Now you can compare original and alternate sounds just by swapping liveries.
If you really want to change the sounds for all repaints its a bit harder, involves copying files and updating an XML file, might be possible to do as a mod but I think it's best to wait for Aerosoft to fine-tune their sounds as you miss a lot of the detail sounds by changing.
EDIT There's a mod to do this and more
https://flightsim.to/file/26633/ccm-s-twin-otter-mod
But you can easily try other sounds (if you can access aircraft.cfg)
eg for the 300 Wheels Pax find the line in [FLTSIM.0]
Sound="\..\..\AS_Aircraft_DHC6_Common\sound"
and change the AS_Aircraft_DHC6_Common to another aircraft eg the Asobo_KingAir350
Sound="\..\..\Asobo_KingAir350\sound"
Now you can compare original and alternate sounds just by swapping liveries.
If you really want to change the sounds for all repaints its a bit harder, involves copying files and updating an XML file, might be possible to do as a mod but I think it's best to wait for Aerosoft to fine-tune their sounds as you miss a lot of the detail sounds by changing.
EDIT There's a mod to do this and more
https://flightsim.to/file/26633/ccm-s-twin-otter-mod