Hello! I wrote a new version of the script.
It is here: http://www.linuxmusicians.com/viewtopic.php?f=4&t=9875&p=30396#p30396

I covered some little bugs, improved his speed and I also mixed samples using sox.
For example, if I had four samples of the same note, I mix them in a new file, changing his name, format and metatags. Do you think it is still too similar to the one provided on the website to re-distribuite?

It doesn't depends no more on ffmpeg, because in some distribution (Debian) it is not distribuited with support to mp3. I use lame instead.

I relaunch my questions:
1)what options would you use to create this orchestra from London Philarmonia samples?

2)Do you want help me?

3)how can I obtain sustain effect compatibly to linuxsampler?

4)I'm new in linuxaudio.org. Do you think it is the case to open a new thread
in the developement section?

Federico