I used to have a Boss BR8, and I now record to ADAT and then bounce to computer. Computers are certainly cool, but you have to keep in mind that they are not made exclusively for audio. To do what you have mentioned above, you'll need: a mic, a pre-amp, some sort of analog to digital convertor, a good sound card, software, and, of course, a computer. If the Boss burns CD's (I don't know the model that you listed), then it takes care of all this stuff except the mic (and it probably has pre-amps, but not so hot ones).
And to program drums, you'll need more software like Acid. For $1500, you still may come out better with the computer, but make sure to price out all of the above so that you know what you're getting yourself into. The main advantage of the computer set up is that you can replace these things above one by one with better stuff and get a better sound. The Boss is an all-in-one box, so you can't improve any one part of it, that's what you get.
you probably just read an amateur opinion
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