TrentAustin

could it be where there's some slight plating wear on the mpc and you're tasting brass?

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Trent Austin
http://www.trentaustin.com
http://www.onlinejazzimprovisation.com
Yamaha EM
Yamaha Chicago C
1939 Martin Handcraft Imperial (restored at www.osmun.com)
Olds Clark Terry Flugel
Schilke P5-4
Morrison MDT (coming SOON!)
Other horns fs in Marketplace
Wedge SST mpcs