rnvinc
Maybe you could get someone in your area to email you some of their HB recorded files to play with.
I can send you some of mine (I am in Southern California water temp today was 54 degree F), but I fish a small reservoir which is void of timber, so you do not get a lot of structure other then rocks and boulders, some channels.
But for some of you eagerly waiting for the spring thaw you may want to ask someone with good pics to send you some files.
George