Hi Uncle Dave!
I paid attention to your post because I'm interested in what extra functions and advantages have external over internal vocoder units.
SD1 is my first connection to vocoders ever and I'm very happy with it, it's a great tool to improve arrangements . I don't miss any functionality because I simply don't know what else to expect from a vocoder.
If you are willing to put down few features to explain, what can I benefit with external unit, I'll be gratefull. Which model should I test?
Thanks.
Luka