well another hr of work and the marlerne is playing like a champ! the key heights were way off making many notes stuffy and muffled. the horn was recently completly rebuilt but must have been by an apprentice and since it was a school horn-nobody cared, classic outcome for an alto clarinet sad to say. blame the insterment for being obsolete and poor desighn. for 125$ and zero spent on repairs (thanks to myself) i have a decent useable alto. this thing sure is mpc picky tho. of all the mpcs i have including top names-it likes the yamaha and the glotin of paris the best. the mpc supplied with it is just terrible. tone like a dying goose!