470k resistors on Tonepad's Ross Comp

[xorophone]

Hello! What are the 470k resistors (Ra & Rb) on Tonepad's version of the Ross Compressor used for? I used 510k resistors instead because I didn't have any 470k. This should probably not make a noticable difference because it's such a small jump, but I'd still like to know what they're used for, in case I have to fault diagnose the circuit or something later.

Here's a link to it: http://tonepad.com/getFile.asp?id=9

Thanks!

[Keppy]

Those resistors bias Q1 and are the primary determiners of input impedance. Your substitution shouldn't make any noticeable difference. Good luck with the build!

[xorophone]

Those resistors bias Q1 and are the primary determiners of input impedance. Your substitution shouldn't make any noticeable difference. Good luck with the build!

Thank you, Keppy!