The credit for this bewitching music should not go to the instrument. It is the revelation of the Divine secret through it that makes it so. Though the music emanates from the violin, yet the secret of its success lies in the hands of its player. You have the makings of becoming a royal falcon to work wonders. Only a serious effort on your part is necessary. If you make it(and you have the freedom of will to do it), you will have the costly goods in the bargain (i.e. immortal life).
Note: ln this verse Shah seems to have hinted that a human being is a mere instrument in the hands of Allah, yet he urges that a human effort for achieving success is sine qua non.
ماچوں نائیم و نوا در مازتست
ماچوں کوہیم و صدا در باز تست
(Roomi)
We are like a flute and the music within us is from you. We are like a mountain and the echo comes from you.
But what is the role of the person in whom this drama is enacted? Ghazali's reply is that he is only the stage and the only actor on the stage is Allah (The Metaphysics of Roomi).
در توکل جہد و کسب اولیٰ تراست
تا حبیب حق شوی ایں بہتراست
(Roomi)
Effort is essential even when you commit your affairs to Allah. That way you shall be a friend of Allah.

strings hold no other secret but with
Divine message vibrate,
Through bard's skill and not just by sound of strings,
Responds like a falcon, be quick and fly to increase your worth.

It is not the music, it is some mystery vibrating in the cods,
Though all tell it be the fiddle but it the hands of the fiddler,
Pounce like a falcon to gain the precious.