@mnstri, Vuo doesn’t hard-code any baud rate; it just uses the system-wide baud rate for that serial port.
You can change a port’s baud rate using the stty command. Open a Terminal window and run stty -f /dev/cu.usbserial-A60049zx 19200 (substituting your device path and desired baud rate), then start your Vuo composition, and it should work.
I’ve converted this post into a feature request; we’ll plan to add a way to set a port’s baud rate in the upcoming Vuo release. (I didn’t include this Vuo 1.1 since I was under the impression that modern USB-serial devices would autonegotiate the baud rate, but apparently I was mistaken.)
Ah, thanks for the clarification. Somehow I didn’t realize that was the case. But yes, thanks for implementing the change. Good job on the update otherwise too!