Beep-it.
My good friend Mr. Michael Una has this awesome device for sale on his etsy.
It uses light to make modulations in pitch, has a 1/4” jack for connecting to other equipment.
You can get one on his etsy here.
He also has a limited edition version on sale at Transistor Gallery in chicago that’s Bamboo Laser Cut. Pretty sweet.
Info about transistor chicago here:
