Pianoteq sound failure.

Having loaded the latest version on an i5 Lenovo thinkpad laptop, I have sound direction output issues that I cannot fathom.
After setting up the audio module within Pianoteq and testing, there is sound from my moniter speakers, but when I play a chord the sound is only from the inbuilt laptop speakers.
Checking my audio set up via control centre seems aok, and testing output within Window's control centre sends sound to the moniters.
I have rechecked the Pianoteq audio set up (ASIO etc etc) and everything seems fine and works in test mode.
Playing the pre-recorded jazz tune is fine, going to the external speakers (only).
What am not doing correctly.?