I had the Hum Debugger for a few days and got rid of it (it just didn’t do what I wanted and changed my sustain properties too much!) First off (this is not the best place to say this!), EHX pedals are noisy in general. I don’t own a single one that is quiet and I have several! Some are more noisy than others but to me I don’t mind the sound for the sounds produced by the pedals! Also I have heard from many people the ISP Decimator is by far one of the best noise reducing pedals. I have never used it but that’s what I hear.

You could always try out an EHX #1 Echo first, that is before going for a “cheaper” pedal. The #1 Echo gives great delay and is not too expensive (compared with the DMMs).
And regarding reducing hum and hiss, EHX choose to have a bit of noise in their pedals though I have always found it well within reason considering the great sounds the effects produce. Maybe you should try out a Noise Gate type pedal which simply cuts the signal when you are not playing.

BTW, you can sometimes pick up a vintage EHX Noise Gate pedal called the Silencer in shops or on eBay. I have used them in the past and they worked fine for me.

as you found out the Hum-debugger won’t remove hiss..and as it’s been suggested already you really need a gate type pedal. ( although these will throw up a whole other load of problems if you like to switch between clean and dirty or use boosts and things)

The Hum-debugger works amazingly well for removing electrical hum from guitars pickups, hum from overhead electrical lights and stuff like that, it helps a lot of you have a badly shielded guitar or any kind of electrical noise … unfortunatly it can’t remove hiss from a chain of pedals. No pedal is totally silent and the more you add the worse it will get, if a fact of pedal life I’m afraid.

I find most of those daisy chain things to be noisy. The Voodoo Labs PP2 is a good power supply, as each pedal is isolated from the others. Behringer, as you say, are not known for their quality products, and a lot of EHX pedals can be a bit noisy. I hate having a tuner in-line too — seems superfluous. Shove an true bypass A/B box in there as a tuner mute.

Have you tried running everything off batteries and see if that helps any?
Take each of the pedals out of the chain one by one and see if you can find the worst culprit that way.
Another common source of noise is the cables you’re using — from your guitar to the pedals, the patch cables between pedals (those cheapie moulded plastic ones are terrible -get some George L or Planet Waves or something, painful as it is to spend $50-100 on cables), and to your amp.
You have a lot of dirt pedals — double muff, overdriver, and BMP — all three ofthose on at the same time will sound like FSSSSSSSSSSSSSSSSSSSSSSSSSHHHHHHHHHHHHHHHHHHH!
Most people normally stack dirt pedals in the order of least to most gain (so put th eblues pedal first, then double muff (that thing is noisy IMO — it’s a pair of muff fuzzes stacked, and they’re noisy on their own), then BMP.
I’d bet that Sovtek Small Stone is pretty noisy on its own.

Doesn’t your amp have a spring reverb? Maybe you can lose the Holy Stain and use the amp’s reverb?
It doesn’t have a top boost or treble booster on it does it? I have a few Rangemaster-type things and they can be pretty finicky with other pedals, especially wahs (and your Q-tron kinda counts) and fuzzes.

I’ve got eleven pedals on my board right now, and all of them are silent when bypassed. If everything’s bypassed, the only thing I hear is the slight hum of my amp.

Some observations- some pedals are noisy even when bypassed. I used to have some cheap pedals on my board- Danelectro and Arion type stuff. When I removed all of them, it made a HUGE difference.

Another thing- power supplies are very important. For awhile I was just going with a visual sound onespot (which was very quiet), but my SMMH, Frequency Analyzer, Polyphase and HOG couldn’t be used with a 1spot, and then my DT-10 started getting noisy with the onespot because it wasn’t getting enough amperage because I had too many pedals on it.

So I sold my Polyphase (because I wasn’t using it much) and bought a Voodoo Labs Pedal Power 2+. It tidied up by board (no ugly/messy power strip) and allowed me to make my tiered board into a flat angled board (no need for a ton of space for a power strip anymore.) I was able to power everything except the Frequency Analyzer, but it has a courtesy outlet to plug a wall wart into, which is how I’ve got it set up right now.

I own about 40 pedals. The only ones I have problems with are three two out of three of those are electro-harmonix. I own five electoral harmonics pedals total only two of them stay on my live pedal board because those are the only two I can rely on did not buzz pop or quit working occasionally what a shame.