Unfortunately it stopped working again. I have to switch the Sylphyo on/off several times to get the internal sounds working.
Sound on the Link is OK also when direct sound on the Sylphyo is not working.
This never happened before the update to 1.4.3.
Anybody else with this problems?

I also had no direct sound after the update. I had to switch it off and on and then it was working.
(I should have read the on-screen message after the update)