Hello Claz,
I just read this thread on 22OCT2011, even though it was authored 08SEPT2011.
There is a way to control two Pianoteq sounds on a single keyboard, even if the keyboard does not allow splitting itself into two midi channels. Aside: I use Pianoteq PRO, and am not sure whether this can be done with the Standard version.
If you wish to achieve the marimba at notes lower than C4, and have the vibraphone play all higher notes starting at C4, do the following:
1) Create two instances of Pianoteq and keep them both as recognizing Midi channel #1.
2) Now, to get the vibraphone to play all notes starting at Middle C, simply edit the sound such that the volume is zero for all notes below C4.
3) To get the marimba to play all notes below Middle C, simply edit the marimba's volume such that its volume is zero for all notes above C4.
Happy split-keyboard playing!
Cheers,
Joe