Thanks Dave and Bernie for your answers.
Ok. Dave, basically I will need to plug stereo the TY, + a P90 piano + a rackmount synth + a guest (guitar/mic)input. This mixer will have a double use: submixer in band situation and main mixer at home.
I also had a look at Alesis which makes a 3U rackmount, but the price raises at approx. $450 here in Italy.
I had a look on the internet at both samson 2U, and at the Eurorack pro. Prices are interesting. Buying a separate 1U EQ module will not help equalize separatly at least four channels in your experience, will it?
Thanks for more comments.
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Amelio