Having used External Insert and knowing it is working correctly got me started on using it for determining the "true" audio latency of different interfaces ... and being an engineer I feel compelled to understand the numbers I measure ... it may be sick, but that's what years of engineering does to you :-(
 
... but thanks to your info I got it figured out now!!
 

brundlefly
SONAR's 'reported' RTL in preferences will typically be smaller than the CEntrance measured value at any given buffer size by anywhere from 1 to 50 samples because the driver under-reports it; this 'hidden' or 'unreported' latency will need to be entered as the 'Manual Offset' in Sync and Caching to get perfect record latency compensation with automatic compensation enabled.

Just yesterday I determined that "hidden/unreported" reported latency to by measuring latency of a looped back transient (82 samples = 0.85 msec).
 
If I use that 82 as the 'Manual Offset' in Sync and Caching I get perfect automatic record latency compensation.
 
If I now add that to the numbers reported by ASIO for RTL, the numbers start to makes sense ... RTL is now corrected for fixed hardware latency and External Insert consistently reports lower numbers (by exactly one host buffer) i.e. you can use External Insert to measure true latency but need to add one host buffer to the reported figure to get the real number ...
 
Host Buffer:   32  Safety Offset:  32 RTL:  210 Samples  2.19 msec --- External Insert:  179 Samples --- External Insert - RTL: -31

Host Buffer:   64  Safety Offset:  16 RTL:  242 Samples  2.52 msec --- External Insert:  183 Samples --- External Insert - RTL: -59
Host Buffer:   64  Safety Offset:  32 RTL:  274 Samples  2.85 msec --- External Insert:  211 Samples --- External Insert - RTL: -63
Host Buffer:   64  Safety Offset:  64 RTL:  338 Samples  3.52 msec --- External Insert:  275 Samples --- External Insert - RTL: -63

Host Buffer:  128  Safety Offset:  16 RTL:  370 Samples  3.85 msec --- External Insert:  243 Samples --- External Insert - RTL: -127
Host Buffer:  128  Safety Offset:  24 RTL:  386 Samples  4.02 msec --- External Insert:  259 Samples --- External Insert - RTL: -127
Host Buffer:  128  Safety Offset:  32 RTL:  402 Samples  4.19 msec --- External Insert:  275 Samples --- External Insert - RTL: -127
Host Buffer:  128  Safety Offset:  48 RTL:  434 Samples  4.52 msec --- External Insert:  307 Samples --- External Insert - RTL: -127
Host Buffer:  128  Safety Offset:  64 RTL:  466 Samples  4.85 msec --- External Insert:  339 Samples --- External Insert - RTL: -127
Host Buffer:  128  Safety Offset: 128 RTL:  594 Samples  6.19 msec --- External Insert:  467 Samples --- External Insert - RTL: -127

Host Buffer:  256  Safety Offset:  16 RTL:  626 Samples  6.52 msec --- External Insert:  371 Samples --- External Insert - RTL: -255
Host Buffer:  256  Safety Offset:  32 RTL:  658 Samples  6.85 msec --- External Insert:  409 Samples --- External Insert - RTL: -249
Host Buffer:  256  Safety Offset:  64 RTL:  722 Samples  7.52 msec --- External Insert:  471 Samples --- External Insert - RTL: -251
Host Buffer:  256  Safety Offset: 128 RTL:  850 Samples  8.85 msec --- External Insert:  596 Samples --- External Insert - RTL: -254
Host Buffer:  256  Safety Offset: 256 RTL: 1106 Samples 11.52 msec --- External Insert:  851 Samples --- External Insert - RTL: -255

Host Buffer:  512  Safety Offset:  32 RTL: 1170 Samples 12.19 msec --- External Insert:  655 Samples --- External Insert - RTL: -515
Host Buffer:  512  Safety Offset:  64 RTL: 1234 Samples 12.85 msec --- External Insert:  723 Samples --- External Insert - RTL: -511
Host Buffer:  512  Safety Offset: 128 RTL: 1362 Samples 14.19 msec --- External Insert:  852 Samples --- External Insert - RTL: -510
Host Buffer:  512  Safety Offset: 256 RTL: 1618 Samples 16.85 msec --- External Insert: 1107 Samples --- External Insert - RTL: -511
Host Buffer:  512  Safety Offset: 512 RTL: 2130 Samples 22.19 msec --- External Insert: 1619 Samples --- External Insert - RTL: -511

Host Buffer: 1024  Safety Offset:  32 RTL: 2194 Samples 22.85 msec --- External Insert: 1171 Samples --- External Insert - RTL: -1023
Host Buffer: 1024  Safety Offset:  64 RTL: 2258 Samples 23.52 msec --- External Insert: 1235 Samples --- External Insert - RTL: -1023
Host Buffer: 1024  Safety Offset: 128 RTL: 2386 Samples 24.85 msec --- External Insert: 1364 Samples --- External Insert - RTL: -1022
 

I get it; I like to understand the numbers, too. Note that CEntrance Measured - SONAR Reported should give you that same 85-sample Manual Offset.

centrance
i downloaded the asio testor and have no idea how to get to work?
i have komplete audio interface
any help from anyone
thanks

Why do you need a different external interface tool beside what is already provded?  The external insert works fine. 

i dont know