Even though they display that way, they really want 0 to 1, so instead of that, just back out when you hit control shift E then use the numpad with numlock on to adjust it. 4 and 6 move it left and right along the timeline, and 2 and 8 adjust the parameter value. You can actually have this done automatically for you if you have SWS - which you should. Arm the envelope as normally done, then make a time selection. You can navigate to the start of the item with control left or right, then ctrl shift dot or greater than to go to the item's end to place the second point. These are placed with the left and right bracket keys. Once you have that, select the track, then the envelope, then hit O.What this will do is use an LFO to plot envelope points. You want it to say selected track envelope, and probably when it says the note, hit end and it will say sync off then tab and then enter a number in Hz. The offset really doesn't matter for now and the strength is how much you want it to oscillate by. If you choose saw or ramp, you should get a circle but you won't with sine, and this is provided strength is at 100. Hit OK, which you might have to use NVDA enter or shift space or something then home to go the start of the time selection then hit play.