Just added master mode to the 16n firmware (a 16 fader unit that is in development over on the monome forum). It can communicate with the ER-301 directly over the i2c integration that was created for the Monome teletype. No CV patch cables necessary.
Here is a video of me testing the integration controlling just seven parameters on the ER-301. You can also see a few other modules responding to the i2c in the background (a monome Ansible and 4 TXo).
Learn more about the 16n here: