Here is mine in TS-2014 v38.3a and my clone of the Denmark-2000 using welded rails have increased their intervals to 300m:

http://www.otto-wipfel.co.uk/video/ts-2014-track-sounds.wmv

That of course affects most routes using them, not like in MSTS where every route has its own Ttype.dat, using the excellent Railwaves track joints and my going over switches sounds, a DASH-9 leaving my Gold-Spike-X route at Whitefish:

http://www.otto-wipfel.co.uk/video/msts-track-sounds.wmv

However, new RSC routes now having their own folders and their specific for them Trackbed Rumble, their joint sounds intervals can be modified, but improve their switches and track joint sounds I have no idea how to do !