This video shows how to send midi_cc messages from Sonic Pi to control visuals in the Hydra live coding language. This involves using webMidi on the Hydra end to receive the messages from Sonic Pi.
Hydra web editor: https://hydra.ojack.xyz/
Hydra webMidi Code: https://github.com/ojack/hydra-standa...
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(Note: I do not receive any financial compensation for promoting Sonic Pi. It is just a platform I am passionate about both as a musician and educator.)