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I read couple of topics with this theme and I got good picture for building, components... However I need to ask couple more and confirm some old question about rectifiers.
I found this two op amps on my supplier page:

http://store.comet.rs/CatalogueFarnell/Product/2046837/

http://store.comet.rs/CatalogueFarnell/Product/531563/

So first is dual and second is quad with very simillar price. I want to make p.rec. for at least 10 inputs. I nioticed that inputs connected on ps add on board have superior signal over others without recitifiers's so I want to supply them with diy p.r.'s. It is better for me to use LMC6034 quad for stereo inputs right!?
So last question will be: am I right , will prec.rec's give better and smoother signals on the output as I think they do?

The schematics show that chip (LMC6034) but I think Dmitri doesn't use that one anymore and recommended some alternative ones. I'd have to look it up, it's from an old thread.

privatex wrote: I nioticed that inputs connected on ps add on board have superior signal over others without recitifiers's...

So last question will be: am I right , will prec.rec's give better and smoother signals on the output as I think they do?

Inputs with a precision rectifier are not superior to other inputs except for positional sensing processing. A side affect of a precision rectifier is that it cools a input signal so if a pad/cymbal is too "hot" you won't need a voltage divider on such input. Most likely you have not configured an input for your pad properly and/or it is too "hot" so you just need to cool it with a voltage divider (a simple resistor of 5k-25k in series with a piezo will do depending on how "hot" it is).

dmitri wrote:A side affect of a precision rectifier is that it cools a input signal so if a pad/cymbal is too "hot" you won't need a voltage divider on such input.

Thank you for reply.
Two inputs (one with and one without pr) with same pad, identical configuration and one cable gives me different results and that's ok but hi level are same (that's weird, it's not 'hot') and first with pr have clear signals and second have huge amount of false triggering. That is not same behave as in theory and it intrigues me so I asked for second opinion. Maybe it have more good old side effects! :
For second test I used other inputs but with same characteristic as in first test and there I had significant hi level difference (as it should ok).
Look I know what absolute values of the input signals means, 'cooling' pads with his presence is one advantage but at the end theres always some deviations with all that parametres, pads, all mechanical parts, piezos and MD (temperature and strokes mainly).
My pads are configured perfectly now, it was not a 'human factor' :)