I actually like the look of lxde very much, but......

. I've noticed that two of my "essential" apps - k3b and audacity - are not available in the repos. Is this because:
1. I haven't installed yet (just using the live-CD at the moment)
2. They're not yet in the repos, but will be later or
3. They'll never be available due to some technical/other incompatibility ??
If the latter (and just to satisfy my curiosity), why? I've always assumed that if the "guts" of the OS, i.e. the kernel, is the same (as another release) then there's no reason why the same apps can't run in both environments. Looks like I'm wrong.

Thanks.