Hi, if it was me. I'd put 1 or 2 seeds per cup. I've successfully WS lots of grasses before. I'd also wait until it warms up a little in the spring. Maybe somebody else can give you more specifics.
Duane

I haven't done other grasses, but I've sown the blue fescue and it did very well. I planted just like you would for the HOS but used individual size cups instead. Come Spring I had nice "plugs" to set out and they grew really well.

In the unlikely event that you are not already aware of Gardenweb's Ornamental Grasses forum I am passing along this link. It is a slow forum but there are often good answers there.