Hi everyone. I created a wav that contains an intro that lasts 6 seconds. I assigned it to the C1 key but it forces me to keep the key pressed to make it sound all over. Is there a system that allows you to "play" all the wav to the end, without being forced to hold down the button?

This is quite normal for an AWM2 Waveform designed to play as a pitched musical instrument. When emulating most acoustic instruments you want the sound to begin at Key On and continue to sound until you let go of the key. This amplitude envelope describes instruments that are bowed or blown... where the musician determines the length of note by continuing to apply pressure to the instrument. These are self-oscillating instruments - as long as you apply pressure they continue to vibrate and generate sound.

The other major category of amplitude envelopes describe sounds that are hammered, plucked or struck... called percussion instruments. The envelope of these sounds begin at Key On (trigger event) and the complete Waveform can play without you having to hold down the key. Notice when you hit a Drum the entire sound plays without you having to hold the key down - play a Crash Cymbal, for example.

In Drum sounds you can tell the Element to ignore Key Off... this will mean the amplitude envelope that you design will apply and determine how the sound behaves after being triggered.

The Amplitude Envelope is described by several steps of Level and the amount of Time it takes to reach those volume levels.

I tried to import wav as with init AWM2 and Drum both. I set AMP EG Decay on maximum value and Release on maximun value (obviously regard correct part/element)... but nothing to do! I must press C1 key to hear all... Suggest to solve it?

You were on the right track when you selected to import the .wav to a Drum Key. Not only can you design the amplitude envelope for each Key, but being in a Drum Kit you can set the Key to ignore Note-Off.

Call up the Drum Kit
Press [EDIT]
Activate the Drum Key “Keyboard Select” and select your target Key, C1
This will recall the data of this Key
Touch “Osc/Tune”
Tap the “New Waveform” box and load your .wav to C1
Set “Assign Mode” = Single
This will only allow one instance of the Waveform to play at a time
Set “Rcv Note Off” = Off
This will prevent the sound from ending when you lift your finger

Touch “Level/Pan”
Set your Amplitude Envelope
Attack Time = 0
Decay1 Time =127
Decay2 Time = 127 (maximum) Hold
Decay1 Level =127
This envelope will let the full audio clip to play without you holding down the key.

When you used Init Drum, did you turn off "Rcv Note Off" on the drum key you assigned it to?