Hi,
I'm not visually impaired, but I prefer text-based composition tools
myself. I'd recommend checking out (in no particular order)
compo (built on tom of cm/clm/cmn)
midge (perl module for making midi files)
haskore (if you're a programmer)
I use all these and some home-grown python code to produce and mangle
midi files into a final form I'm happy with, then I use csound or
timidity to render the midi files to audio, then ecasound to mix the
audio together. No gui required from start to end.
Cheers,
Stuart
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Stuart Allie