im after some music mixng software

im looking to mix a song in together, so the song dosent seem to end,

i have used nero and took the 2 second pause out but it sounds crap, so i want to mix it in atleast -10 seconds

also looking to add some music effects, some speech and that sweep noise

by sweep noise, i mean the noise the dog makes of sooty and co,

if your a clubber like me you would have heard it...

is there any easy to use software which will let me do this??

cheers guys