Vintage/modern switch to chunk chunk

[zilla]

Gentlemen,

I have been trying to figure out how to add a vintage/modern switch to my chunk chunk.   I found this post

http://www.diystompboxes.com/smfforum/index.php?action=printpage;topic=81411.0

With this schematic


http://img509.imageshack.us/i/drss.png/

Here he says he added a switch to go between vintage and modern.   From the diagram it switches between two capacitors coming out of q1 to ground.

I looked at the circuit diagram for the chunk chunk and determined that this was where c3 was.

I took c3 out and replaced it with a wire going to a switch that would let me go between a 1 uF cap and a 470nF cap

Unfortunately I can barely hear any difference, if at all.

Does anyone have any insight into this?  Would be greatly appreciated.

Thanks

Tim