Hi burviji, and thanks for engaging in this conversation. We appreciate you sharing your own personal experience using a spacer with your metered dose inhaler (MDI). If I remember correctly, the little 'harmonica-like' sound is marketed by the manufacturer (Medline), as actually promoting a proper inspiratory flow rate. As you said, the sound is heard when the patient is inhaling too quickly. It is meant to suggest to the patient to inspire more slowly.
Are you finding it tricky to use the spacer? If so, what seems to be the issue - perhaps we can make a suggestion to make it easier for you.
Wishing you well,
Leon (site moderator asthma.net)