My quadraverb has no effects information on the screen, but all the effects work well .can someone tell me why thanks jon.

The parts that control the volume and have the volume work are broken then and should be replaced.

The power jack should have a little diagram that shows the ring and tip. The ring is the long sleeve on the plug, and the center would be the tip. The diagram should show the polarity. It's usually minus to the outer sleeve (ring), and plus to the tip. It might be on the adapter spec plate also. How to tell polarity expected of DC barrel jack
The circuit board should indicate the polarity (plus and ground).

SOFT RESET- HOLD PROGRAM AND COMPARE AND POWER ON. ( SETS GLOBAL TO DEFAULT, CLEARS EDIT BUFFER, LEAVES USER MEMORY INTACT).
HARD RESET- HOLD "PROGRAM", "COMPARE" AND "-BLOCK" AND POWER ON. (SETS ALL FUNCTIONS TO DEFAULT AND CLEARS USER MEMORY).

This is an intonation issue. If you can find a music store that works with violins, talk to someone there who will certainly be better informed than I am. At least they can tell you if it's worth your time to fix it, or more cost effective to replace it.

Tone is a hard thing for some to achieve. Kinda sounds like the amp isn't satisfactory to you as a player. I use an ADA MP-1 with a quadraverb GT and I can sound like Steve Vai with almost any amp. The pedals you mentioned should all sound pretty good with almost any amp. You kinda sound as if your amp sounds wimpy. ALSO, a good metal distortion is a combo of effects as well as tone(layering). The sound you may be expecting may be the sounds of 4 effects combos at a time through a line mixer making it all sound like one sound. I use rack stuff BECAUSE I can get the sounds that NO pedals can give. This also sounds like your knowledge of the equipment needs improvement. True tweaking of gear takes years to perfect, especially if you're a picky guitarist like myself.

The Problem is a dead battery which is soldered to the circuit board inside the unit. It's a Panasonic BR-2325-1HC, but really you can replace it with any similar 3V battery.
Here's how I fixed mine.
http://andrewapeterson.com/2013/08/fix-alesis-q2-first-made-strange-sounds-then-bad-program-issue-quadraverb-2-battery/

I'd need to know what mixer you have, to know if there is a [line out] connection socket and an [internal amp in] connection socket.

"each with own poweramp" I presume means the ep1500's and NOT that the speakers are active (ie containing amps)

***If any of your speakers are active, ask the question again, with more detail.***

So if all your speakers are passive, I offer the following.

I assume there is [effect send] and [effect return] on the mixer

effect send>quadraverb>effect return

mixer line out > eq > compressor > sonic maximizer > crossover

sub output of crossover> amp > sub
high output of crossover to mixer's internal amp input
mixer's speaker output > main speakers

monitor output > other side of eq (>other side of compressor if desired, but use sparingly ) > other side of sonic max if it is true stereo , otherwise skip > amp > monitors

If your mixer doesn't have an input to its internal amp, we are "back to the drawing board"
With questions like this it pays to give as much detail as possible; model and make of each component etc
I have done my best with the the info you have provided.
Don't feed amp outputs into powered speakers

The effect loop is to use exteernal effect module... It is NOT to use guitar pedals !!!! The signals are line levels, NOT guitar type levels. An example of a device might be an Alesis Quadraverb. You take the effect send jack and run it into the inout of the effects module and the output of the effects module into the effects return jack. Many try to use guitar pedals and massive distortion results because levels are too high for the pedals.

This sounds like a power supply problem. Check the voltages... especially the 5 volts.

Personally, I like to have all "tone effects", such as wahs, distortions and equalizers in front of "time effects" such as phasers, chorus, flangers and delays. See my set up in the photo. Guitar input is from right to left, starting with the wah pedal.
Tom, 30yr player