Built a Foxx tone machine. It doesn't work.

[Badman]

So as the topic says, I built a foxx tone machine following the schematic from  Fuzz central (http://fuzzcentral.ssguitar.com/foxx.php) with some component substitutes, most notably diodes. The stomp box is wired with 2 spdt stomp switches (not a true bypass) and it functions as follows: clean and fuzz modes work ok, but operating the octave switch does nothing except for a brief 1 second volume drop, after which it sounds exactly the same as when it is in octave off position. Clicking the octave switch back off does nothing, not even the volume drop.
Component substitutes:
                                 transistors: 2n3904 (instead of 2n3565
                                 diodes:        AA 133 (instead of 1n34a)
                                 R1:             4M7 (instead of 1M or 1M5)
                                 R23:           15K  (instead of 10K)
Voltage readings (V):
                                 Battery:  9,54

                                 -Q1: C    0,31                        
                                         B    0,88                            
                                         E    0,26

                                 -Q2: C    9,49
                                         B    0,31
                                         E    0,02

                                 -Q3: C    7,22
                                         B    0,84
                                         E    0,23

                                 -Q4: C    7,35
                                         B    0,79
                                         E    0,21
                                  -D1: K    1,03      A   0,95
                                  -D2: K    0,88      A   1,03
                                  -D3&D4 reading 0V  at both ends
Component substitutes and voltage readings labeled according to ggg schematic: http://www.generalguitargadgets.com/pdf/ggg_ftm_sc.pdf?phpMyAdmin=78482479fd7e7fc3768044a841b3e85a  
I retraced the pcb and everything seems to be wired and soldered correctly. I suspect the diodes. Any thoughts?  
EDIT: Readings were taken with all the pots set to minimum (far left).                           

[Mark Hammer]

Simple test.

The signal produced at the one diode is identical to the signal produced at the other.  Combining them produces an octave-doubling, but using only one of them (whether the one normally maintained or the other one that gets disabled) will get you "normal" fuzz.  If you get fuzz with the octave switch off, then you should be able to get fuzz if you cut the connection to that normal path and use the "octave" side only.

If you do get fuzz, then chances are good the diode is the wrong way around.

[Badman]

Is it supposed to be hooked up to an amp? My meter has setting only for 200V and 300V range in case of AC, will it do the trick?

[Badman]

Will try, but the diodes are definitely wired correctly. I checked and rechecked it about ten times now. Unless the side which has a little green band on it is the anode. In which case I screwed up royally.

[Mark Hammer]

Is it supposed to be hooked up to an amp? My meter has setting only for 200V and 300V range in case of AC, will it do the trick?

It would depend on the meter.  If it is autoranging, then it will adjust the scale and the unit of measurement (the stated AC voltage - 200VAC - will be the maximum).  If it is a budget meter and the AC range is intended solely to test for whether a wall-socket is live or not, then you'll need another meter.

And no, it does not need to be hooked up to an amp.  All it needs is a signal source in roughly the same range as a guitar, and a 9v battery.

[Badman]

It's a budget model. I'll try audio probing technique and see whats happening around q2.

[Badman]

OK, so i audio probed q2 and D1&D2.  With the octave switch ON, i get signal on both ends of both diodes, and it sounds clean, and pretty much the same on each diode. q2 also produces clean signal on both collector and emitter. with octave switch OFF, i get signal on q2 collector and both ends of D2 only, so q2 seems to be ok. Foxx tone machine Y U NO produce octave?
EDIT: I also replaced the R23 with the correct value (10K) resistor, but still no luck.