If C# is sounding Eb, then something is amiss. On a sopranino, a C# should sound E natural. Could it be you playing flat or not having the mouthpiece pushed in enough. Are you an experienced player? Are you using a nino mouthpiece (and reed) or a soprano mouthpiece?It is about 18 inches. I re-corked it and it plays open at Eb. Actually all the pads are good except for lower one..