I trust your judgement, because the 4 pi's I made are so nice. Actually the discussions at lansing were rather confusing to me with all the different sizes and tunings and on and on. Your explanation makes sense to me. The paper by Dr. Toole is good too, though I must admit my limited pre-hansle mind of technical literature makes my eyes cross after a few paragraphs. But I follow instructions pretty good. Any chance of obtaining the professional 7 pi plans and the means to augment the tuning vent for this beast? Thanks.

Rick