I buy a lot of calls because they are inexpensive and I like to mess around with them. I have both the Buck Roar and the Buck Growl (I was bored after tagging out early this season). Anyway, the buck roar and growl have more to do with the cadence and length of the call than anything else. They are also louder and more gutteral, and to get that sound you have to blow the call a bit harder. If you try that with a regular grunt call it sounds "ducky" because the call isn't designed to be blown that hard.

As for the snort wheeze, yes the call is just a tube that you snort wheeze through. If you don't get it with another call it is not worth buying. You can get the same effect by cupping your hand and making the sound with that.

IMO the Buck Growl sounds better than the Buck Roar, and it has a much better DVD. The included DVD shows deer making the call very well and lets you see what sound you should be imitating. Both are good calls though.