Not sure if it was
your thread on Reddit, but if it wasn't, here are a few ways I suggested to go about this:
"This pedal should be VERY loud when engaged. Post your transistor voltages so we can make sure there isn't something amiss. You can also audio probe the circuit to see if you're losing a lot of signal when it's on.
That said, there are two decent ways to get extra volume without upsetting things too much. First, you can grab a 22uF cap and solder it across R28 (the 1K on the emitter of the last transistor). This will bump up the AC gain without changing the transistor's bias. It will be a pretty big increase in volume, but inasmuch as it's last in the circuit, you might also get more noise.
You can also change R27 to something larger, like 100K. This will change the biasing, but it's forming a voltage divider with R26 (which is several times larger) and loading the balance pot (which is a heavy load when the balance isn't maxed). Increasing it might give you a small increase. It might change the feel a bit, too."
There's no way for anyone to know what's wrong with your build without the same information required to diagnose any non-working build. We need to see it (to make sure there aren't any wrong components), you need to post the voltages on each pin of every transistor, and it never hurts to build and use an audio probe to figure out where you are losing signal to help narrow it down.
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Vids. PCBs: Bearhug & Cardinal:
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