Debugging Super Duper 2-in-1

[codog]

This circuit worked perfectly on breadboard, but when i transferred it to stripboard, it stopped working. I can take some pictures if necessary, but I won't be able to until tomorrow. Any help would be greatly appreciated. Thanks.


1.What does it do, not do, and sound like? Buzzing sound, can be controlled with the second gain pot as well as master volume. There are random loud pops, too. It has worked for an hour long period with a guitar, as well as for a while under a scope, but it seems to not want to work anymore.
2.Name of the circuit = Super Duper 2-in-1
3.Source of the circuit (URL of schematic or project) = I don't think I'm allowed to post it.
4.Any modifications to the circuit? Yes, I made it so that there is only one switch (only a bypass switch, no switching channels).
5.Any parts substitutions? 47uF polar capacitor from 9v to ground instead of 100uF, used 4.7K instead of 5.1K from 9V to Drain.
6.Positive ground to negative ground conversion? No
7.Turn your meter on, set it to the 10V or 20V scale. Remove the battery from the battery clip. Probe the battery terminals with the meter leads before putting it in the clip. What is the out of circuit battery voltage? => 9.00V
Now insert the battery into the clip. If your effect is wired so that a plug must be in the input or output jack to turn the battery power on, insert one end of a cord into that jack. Connect the negative/black meter lead to signal ground by clipping the negative/black lead to the outer sleeve of the input or output jack, whichever does not have a plug in it. With the negative lead on signal ground, measure the following:
Voltage at the circuit board end of the red battery lead = 8.91V
Voltage at the circuit board end of the black battery lead =0V

Now, using the original schematic as a reference for which part is which (that is, which transistor is Q1, Q2, etc. and which IC is IC1, IC2, C1, and so on) measure and list the voltage on each pin of every transistor and IC. Just keep the black lead on ground, and touch the pointed end of the red probe to each one in turn. Report the voltages as follows:

Q1
D = 8.94V
S =2.94V
G =3.01V

Q2
D = 4.50V
S =0.03V
G =2.18V

Z1 (zener)
A =2.94
K = 3.01

Z2
A =0V
K =2.13V