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Try this: Have a Slider which max value is 1 and min value is -1. Now wire it to the input Port for your Y value.
Hover on the Port (the tab where you wire the input) and press Shift+X to cycle through several blend modes. Set it to "Wire Blend - Modulate". Its function will be clear to you with this example.
Set the Y speed to your maximum positive number, for example 10 m/s. Now when your slider goes to 1, your Y speed will be 10 m/s. When the slider is -1, the value will be -10 m/s.
I hope this is useful,
Pablo