make-bandpass is a wrapper around make-fir-filter, returning an fir-filter generator, so mus-xcoeffs does work with it; there's an example in snd-test.scm around line 7706. make-bandpass is not itself a generator; it returns one. If you look at the code in dsp.scm you'll see (define bandpass fir-filter) -- this says the bandpass generator is an fir-filter. In the first case, I think you're setting a vector to the output of the bandpass generator, and in the second it looks like you've copied the make-bandpass code to set the vector, so you're setting the vector to two different things.
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