For the last couple of weeks I've been practising on my Stomvi Mambo which is an extra large bore but did a big band rehearsal on my Olds Recording on Monday and played like a drain. I'm a comeback player of 15 months and have a good routine which I vary enough so that it doesn't become too routine but this is the first time that I've had such an off night. My first thought was that it was nothing more than an off night but what is the perceived wisdom about spending time with one bore the playing either in rehearsal or on a gig on another (smaller, in this case) bore? My symptoms were lack of stamina and range (without ramming the horn onto my face and resorting to the "no technique pressure" method). Any comments or advice would be welcomed. I'm not too worried at this stage but at the same time I'm open to more enlightened advice !