Hi,
It's hard to say what you need...
I recommend to be nit that vague, but much clearer in your description.
* what motor do you use (from small toy motor, stepper motor, up to several HP 3 phase motor, diesel?)
* describe your "timing" (microseconds, secinds, hours...)
* what's your power source.
* what's yoyr audio source?
* what's your expected audio output power?
* (do you need to switch ON/OFF the sudio amplifier?)
* your technical skills. Do you want to design all from scratch or want to use "ready to buy" solutions?
* other information: like: do you want to save power (battery operated, solar operated...), does it need to be waterproof ... or any other features?
Klaus