Add ability to use functions in send float values.

[smokey-live]

I'm trying to adjust OSC values from either a button or a rotary dial. I can successfully read the current value from the device I'm trying to adjust into a custom fader but I need to be able to add or subtract from that value to send a new value. For example, if the value in the device is 50, I'd want the rotary dial to add to that value by 1 or subtract by 1. Because the device wouldn't understand +1 or -1 I need to be able to perform a function on a variable to accomplish this.

Attached is what I'm trying to do that is not currently supported.