Ha !
Just found that :
"If you still have AudioMulch 1.0 installed on your computer you can find your version 1.0 licence key in the Registry using RegEdit. From the Windows Start menu choose Run, type regedit, click OK, browse to: HKEY_CURRENT_USER\Software\Ross Bencina\AudioMulch\1.0\Registered User. "
Help, please....
Ross, mail sent.
...
Ha !
Just found that :
"If you still have AudioMulch 1.0 installed on your computer you can find your version 1.0 licence key in the Registry using RegEdit. From the Windows Start menu choose Run, type regedit, click OK, browse to: HKEY_CURRENT_USER\Software\Ross Bencina\AudioMulch\1.0\Registered User. "