Passive volume pedal problems :(

[superferrite]

A friend gave me a Crybaby shell and said, "make me a passive volume pedal!"  It should work like the guitar volume knob.
Sounds easy, right?
I really should have bought a long-shaft reverse audio-taper 500K pot, but what I DID get was a linear taper 1M pot.
I thought I'd use "pot alchemy" from HERE:http://www.diystompboxes.com/analogalchemy/emh/emh.html
So I have 4.5M resistors between lugs 1 and 2, and 56K resistors between lugs 2 and 3.
Now, how do I wire the jacks up? I can either get a  slight (but nicely tapered) volume reduction if the hot leads are between lugs 1 and 3 OR a linear (pretty much on/off) response with the leads between lugs 1 and 2 or 2 and 3. 
I think it's not going to work, right?
Any advice?   Tell them to buy a cheap volume pedal?

[superferrite]

Getting ready to throw in the towel on this one...

[ACS]

Hi mate, looks like you've based the values off a 90% taper (this means that 50% of the voltage is obtained at the 90% travel point) - IMO this is probably a bit extreme, but should give you proof of concept at least, and then you can tweak the taper to your heart's content once you've got it up and running.  One suggestion would be around an 80% setpoint (2M + 125K), but that's just my opinion   And I'm correct that you're going for a 500K 'final' pot?  So it's humbuckers then?

Anyway, on to the wiring...

Think of it just like a guitar vol pot as you said.  This gives you: hot signal (tip) from input jack comes in to lug1.  Hot signal to output jack (tip) from wiper.  Lug three to ground (both input and output jack).  Should be easy... in theory   If the taper doesn't 'feel' right, then just reverse 1 and 3.

Oh, and check the resistance at both ends of the travel, just to make sure you've put the right value R's in there!!

Edit: just read your post a little more closely - you said "OR a linear (pretty much on/off) response with the leads between lugs 1 and 2 or 2 and 3" - this ties in with my comment about the 'feel' of the taper.  I'd say reverse the connections to 1&3 and you'll be all good.

[superferrite]

Thanks!
I was going to do just what you said today, but you beat me to it.  The % I wasn't sure about, so you cleared it up for me.
You rock!
T

[ACS]

If you reverse the connections to 1&3 and you get a good taper, only in reverse (ie toe down = no signal) then you'll need to reverse the lot - ie swap the resistors and the connections to 1&3.