Hi... I gave this topic a rest for a while... But, still having this issue.... but only with VSTSynthfont64.
Got new computer, fresh installation.
I set VSTSynthfont64, as the default synthesizer (eithher the version supplied by BIAB, or the current version 3.601),
Levels jump from where I set them, when I hit play. (Doesn't happen, with same songs, if using Coyote or TTS-1 as the default synth).
If I import a MIDI file to the Melody track and install a separate instance of VSTSoundsyth64 on the melody track, it works like a dream (On that track and not using a default synthesizer).
Just can't use it as the default synth. VSTSyntfont64, sounds so much better.

Also, similar issue in Realband.