First thought- probably check out V16 reeds, they seem to work very well with a lot of air pressure. secondly- blow hard and add a very slight throat growl... you really shouldn't need any effects, with the possible exception of a slight touch of reverb or analog echo...
Finally- bear in mind the Likes of the Mighty Big Jay actually used very conventional set ups, big chamber ebonite mouthpieces- the whole metal mouthpeice with a baffle thing came in much later
Finally- bear in mind the Likes of the Mighty Big Jay actually used very conventional set ups, big chamber ebonite mouthpieces- the whole metal mouthpeice with a baffle thing came in much later