Roland Alpha-Juno 1/2/MKS-50 chorus rates
This document maps the MIDI CC value of the chorus rate parameter to the measured LFO cycle time in seconds and the corresponding frequency in Hz (aka the chorus rate). The last column is used to indicate the closest matching Roland devices for that particular chorus rate. When the device name is in bold it means that the rates were personally measured by me (using Logic Pro X and measuring the time between peaks of the chorus within the raw audio of recorded samples). Additionally, I measured the chorus rates for each MIDI CC value of the Alpha-Juno. I don't have a Juno-60 or a Juno-106, so the best I could do is measure the rates of the software Plug-Outs as well as the JU-06A boutique. (Surprise, they are not the same!) Device names not in bold and marked with an * were taken from this list: http://www.florian-anwander.de/roland_string_choruses/
More notes are in the bottom row of this sheet.
Comparison video and demonstration of measurement method: