[Nyororin]

It`s totally normal in Nagoya... ですが uses the softer ng-ish sound in a very pronounced way. Saying it hard would just sound weird. Two sounds definitely exist, and although they might not be "officially" taught I can`t imagine someone using the wrong one.

ETA; Looking at and reading the examples that Nagoyankee posted, they`re all very clear but it is really hard to put down in text. It`s like you go to make a g sound but never let your tongue touch as it would in a hard g.