Originally Posted By: Jose Pereira
can anybody tell me if Tyros4 has a drum mixer, editor page?
Hi Jose, smile
Though it's possible with Tyros 2 & 3 to edit & create your own drum kit, it could only be done with the help of a PC computer and PC voice-editor software. With Tyros 4, you can now do this all on the keyboard itself.
In addition to Al's above well detailed instructions for creating a drum kit from scratch, here's how you can edit/remix an 'existing' drumkit via the T4 mixing console.

Mixing Console button > Mixing Console (Style Part) > Vol/Voice Tab

1. Press C button to highlight voice selection section.
2. Press upper toggle of buttons #1 or #2 below LCD screen to open up Voice (Revoice) Window for Rhythm 1 & 2 respectively.
3. Pres upper toogle of button #5 to access "drum kit" mapping & editor

Originally Posted By: Jose Pereira
Also, does Tyros4 reads samples others than wav format?
Tyros 4 only reads UVN samples and supports importing & converting WAV to UVN format, but with Extreme Sample Converter 3.60, along with the Yamaha Tyros 3 file converter (converts TVN format to UVN), you will be able to convert most all of the popular sample formats (Akai, etc) to UVN format for playback on Tyros 4.