I’ve been practicing on the Yamaha YRS-24B the past few months and have gotten down controlling my breath to avoid squeals on the lower notes and got myself the 302s Soprano with the curved windway in preparation for Christmas and I’m having a hard time hitting the low E and D cleanly on it (my F# also buzzes a little). With the yrs24 I can get it by softly breathing but with the 302 it’s kind of hard because it doesn’t sound clean unless I barely breath but then the note comes out kind of quiet.
Seems like a breath control issue, but could also be a poor instrument.
But there are many critical aspects here, particularly if you do not already have a music background. For example, you need to be aware of the phrasing and accordingly the continous flow of air needed to achieve this. As with the breath control needed for the lowest tones, this is a fundamental aspect of playing the recorder. If possible, a few lessons from a good teacher would be very helpful at this stage.