Found out that at least the following notes need some adjustment (where C3=middle C):
B3, D#4, F#4
Some samples have a lot of noise (not bow noise, because one cannot set that in the STRAD).
On occasions the STRAD within Sonar 5 Prod, needs almost all CPU power, without any reason. Cannot reproduce that, but it is a nasty thing because when playing back with orchestra, the whole lot stalls. It mostly occurs when I alter something at CC-level (e.g. #67, Aftertouch, #11 or velocity).
I've set the instrument to only react on CC's only (not pedal with CC).