Hello everybody!
I've done quite a lot of sample editing years back on my A4000 and I used Samplitude, which is a good piece of software.
It has been released for free here, in its page, on the ACT web site (the developers of the Prelude audio card for example:
http://samplitude.act-net.com/
Copy and paste the free key on this page to Samplitude requester.
C U!