I found the answer to the vole problem
I tried the hot sauce, ammonia and some other things, but what works the best is spring-type rat traps baited with apple cubes, placed under a bucket weighted down with a rock. This advice came from the Cornell Coop Extension.
I now have these set-ups all around my garden and have caught voles everyday for 3 days. I am thrilled.
I have now planted my garden worry-free. I put the dead voles next to the garden for a free dinner for any predators in the area. Maybe they will stick around and catch the varmints before they enter my garden.
I feed seed to the birds so why not animals to the predators!