I used to have great fun with the sampling software Technosound Turbo, which comes with a sampler cartridge. There's quite a few vocoder effects on there and you can do it in real-time or sample them direct to HD. Very easy to use. I used to record samples, vocals etc with this and then import them into OctaMED. TT2 Pro has 8-bit and 12-bit options too I believe, although I only had version 1. They pop up on ebay from time to time. I wish I still had my miggy for this
