OK, the next thing to do was figure out a heuristic approximation of the voiced/unvoiced detection that nicer vocoders have, with a burst of noise exciting the carrier for fricatives and plosives, but is inaudible or mostly inaudible at all other times: check. after some experimentation, the curious combination of the 4 pole NLB ladder (to 2p bandpass breakout) for the modulator, and butterworth bandpass for the carrier, seemed to give a surprisingly good result. have always had a suspicion that using the computationally expensive and state of the art ZDF reaktor filters might go some of the way closer to getting a 'classic vocoder' sound. To be frank, i've never been terribly floored by the sound of many software vocoders.
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