Hi Vali --
Thanks, gotcha now.
Maximum is 44,100Hz 16 bits. This is a limitation of the tone generation hardware which is clocked at a multiple of 44,100Hz. I noticed that Montage has extra hardware to handle 48kHz and 92kHz audio, but even that is converted to 44.1kHz 16 bit into the tone generator for digital mixing.
Hope this helps -- pj