All you have to do is show the verse that authorizes mechanical instruments, if you add to the "sing" without authorization it is as Paul calls it "will worship" or "self imposed religion" :
Colossians 2:23 (KJV)
23 Which things have indeed a shew of wisdom in will worship, and humility, and neglecting of the body; not in any honour to the satisfying of the flesh.
Colossians 2:23 (NKJV)
23 These things indeed have an appearance of wisdom in self-imposed religion, false humility, and neglect of the body, but are of no value against the indulgence of the flesh.
Colossians 2:23 (ASV)
23 Which things have indeed a show of wisdom in will-worship, and humility, and severity to the body; but are not of any value against the indulgence of the flesh.
Colossians 2:23 (NASB)
23 These are matters which have, to be sure, the appearance of wisdom in self-made religion and self-abasement and severe treatment of the body, but are of no value against fleshly indulgence.
Colossians 2:23 (YLT)
23 which are, indeed, having a matter of wisdom in will-worship, and humble-mindedness, and neglecting of body--not in any honour, unto a satisfying of the flesh.
Colossians 2:23 (KJV)
23 Which things have indeed a shew of wisdom in will worship, and humility, and neglecting of the body; not in any honour to the satisfying of the flesh.
Colossians 2:23 (NKJV)
23 These things indeed have an appearance of wisdom in self-imposed religion, false humility, and neglect of the body, but are of no value against the indulgence of the flesh.
Colossians 2:23 (ASV)
23 Which things have indeed a show of wisdom in will-worship, and humility, and severity to the body; but are not of any value against the indulgence of the flesh.
Colossians 2:23 (NASB)
23 These are matters which have, to be sure, the appearance of wisdom in self-made religion and self-abasement and severe treatment of the body, but are of no value against fleshly indulgence.
Colossians 2:23 (YLT)
23 which are, indeed, having a matter of wisdom in will-worship, and humble-mindedness, and neglecting of body--not in any honour, unto a satisfying of the flesh.
Paul said to do in the church things in an orderly fashion. I know a few fine Christian folks that are far better off listening than singing although they would love to sing they just can't.
For the cause of Christ
Roger