Arduino bass vibration motor control

Hello anyone knows how to control a vibration motor with an Arduino via the 3.5mm AUX plug. By that, I mean that the vibration motor is activated with lower frequency sounds, (power delivery is still from a 5V source, Arduino has to just activate the motor when there is a lower frequency). Is the Arduino even necessary or is it possible to have a hardwired circuit. Is it also possible to control the speed of the motor when lower frequencies are quieter or louder?

He is already getting help with this in his thread in the Audio section. Mods haven't caught up to the cross post yet.

Let's lock this one up then.