At the time of writing this will work only in Google's Chrome browser. Chrome may block SysEx access if you run this from a website, in which case download the html file locally and run it from there.
This version is for ES-9 firmware v1.1.0 and above.

Send to MIDI port: Listen on MIDI port:

Input DC Blocking
Inputs 1/2 Inputs 3/8 Inputs 4/5 Inputs 6/7 Inputs 9/10 Inputs 11/12 Inputs 13/14

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USB audio
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⇩
Mixer
⇩
LR
⇩
S/PDIF ports
⇩
LR