ADC in C64 Bass Guitar


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I saw this video from Jeri Ellsworth, in which she creates a bass guitar synth using a Papilio One to do the real-time string frequency analysis.

I would like to know how she does the ADC conversion.

I am new to FPGA's but AFAIK the Spartan 3E doesn't accept analog inputs. Am I right?

Do you think she is using an ADC wing? In the video, it looks like look like she is plugin in the 4 analog inputs directly to the FPGA though, see
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