I just bought a really cheap Vandoren 5RV Lyre mouthpiece that I didn't realise until now most likely isn't a 'Series 13' (A=440). Will using this A=442 5RV Lyre on my Yamaha 34 be a really stupid thing to do? Will I be way too sharp? I've only been playing clarinet for a few weeks now but I currently play with good tuning throughout the lower and higher registers. I don't have the mpc yet, it's coming from someone in Germany, but I'd like an idea of what to expect intonation-wise and whether I should just fork out for another Series 13 model. Thanks!