New Bicubic Resizing Filters in VirtualDub 1.47

[kvanza]

Anyone have any information on the difference between the Precise Bicubic Filters for Resizing in VirtualDub 1.47 and older versions which only had one Bicubic Filter. The ones in question are

Precise Bicubic (A=-0.75)
Precise Bicubic (A=-0.6)
Precise Bicubic (A=-1.0)

Thanks in advance.