Generally speaking I find that cheap and nasty mic's seem to work better with vocoders -
probably something to do with the restricted bandwidth. I use an old Tandy tape recorder
mic that you'd pick up on a car boot sale for 20p! I imagine you could pick up a PC
headphone/mic headset for less than a tenner that would do the job.
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An Eagle for an Emperor, A Kestrel for a Knave.