The Entered Effects rate is modified by the Engine

I am using Hog 4 PC (3.13) with a hoglet widget/wing. I'm hoping there is a fix for this. I was programming lights for our youth and wanted to apply an invRamp effect at the rate of 158 BPMs; however, the engine kept changing my entry to 160. 160 doesn't match the drum line of the song; only 158. How do I get it to accept the correct rate? It wouldn't accept 158 no matter which effect I tried. This isn't the first time HOg 4 has rounded up my effect rate, but usually it's not too noticeable.