Re: Dukoff D7 tenor mouthpiece
i bought one (d7, too) and i use it with my reference 54
at first i tried it and man i squeeked like there was no tomorrow...but again, thats cuz it was my first metal piece. but still, i couldnt get a sound out of it because my reed was too thick (i was usin a rico jazz select 3M) and then i went to some hemke size 2.5. now it sounds amazing. it helped me learn vibrato and bending notes cuz it had a bigger size opening. I would recommend it to you...its a bright mouthpiece tho. and, its made of very very soft metal and can be scratched very easily.
i definatley wouldnt use one in marchin band...you might want an otto link for that.
hope this helps