For me nanoloop 2.x is not too limited.
I don't know if it use two DAC.
He don't have table, IMHO it is way more limited for a lsdj or piggy user.
You can't tweak all parameters on the fly, and it's boring.
You don't also have groove or I don't know how to use it.
I enjoy it because you can change pattern or mute mattern "on the fly" and I like this because it sound great and it is simple to use.
Three channel sound similar but sound good without too much tweak or effort.
Vibrato sound really well, envelope are simple but works well.
It is way way more simple to use than a standard tracker and it's not a toy.
Some people make song with it.
I can't make a song with only nanoloop 2.x but have difficulty to make song only with piggy or lsdj also.
I enjoy using a real synth an mpc and nanoloop to loop pattern.
It's the poor monomachine replacement