Just wondering, are there 10 psy models with specific rules for each -Vx parameter?

Example : V0 uses more bits and can be less criticall, while V9 has so less bits could it be it uses another psy model completly finetuned for a very few bits.

Or is it the same psy module for each setting?

Its not a well written question, but i dont know how i could discribe my question better, so i hope you understand what i am saying :-)

IIRC different quality means different ATH:
http://www.hydrogenaudio.org/forums/index....ost&p=12586
http://www.hydrogenaudio.org/forums/index....st&p=328773

Does it means 1 model or 10 different?

They also have different low-pass filters, as well as more subtle differences.

Same psychoacoustic model, but different thresholds.