Hi, Florian!

Although this is my first post, I am a longtime user of BIAB from its DOS days through Version 2011.5, with every version of Windows from 3.1 to Windows 7. I am having a problem very similar to yours, and have a pending support case with PG Music.

In my case, when I render a song to a .WAV file, it will start out fine. Then all MIDI instruments gradually disappear, leaving only the Real Drums playing. I cannot render to either .WMA or .MP3 at all. With the guidance of the Support Team, I have tried setting after setting without success. I have an onboard sound card and have had no problems rendering in either Windows XP or Vista. My problems began a few weeks after a fresh Windows 7 installation and several automatic "updates" from Microsoft.

Here is my current workaround. Compose the song in BIAB until you are satisfied with the result. Save the song as a BIAB file. Then close BIAB and open the song in RealBand. I don't know why, but I am able to render to both .WAV and .WMA files in RealBand. I use a third-party converter to then render the .WAV file to .MP3 if necessary. I have been able to successfully render the files in RealBand using any DXi synth, and using either MME or ASIO4All drivers. And this may give you hope. I am using a 2008 HP notebook for which the Conexant soundcard drivers have not been updated since March of 2008.

If nothing else has worked for you, I hope you will try this method. Hopefully, PG will come up with the solution since there are at least two of us experiencing this problem.