With regard to my quick hack analyzer / sampler: I changed it to make it available from the IDE. However I did not try it. Hopefully I made no typos...
Since it allocates 1K for the buffer and serial needs some space as well you need a 328 or 644 to run it. Otherwise you need to make the buffer smaller.
And one more thought: it is only reasonable if you have way more time than money. As already mentioned you can get much better ones for little money.
Udo