A harmonica positioning device includes a yoke, support member, gear arrangement, and motor. The yoke encircles the musician's neck. A first portion of the harmonica support member releasably couples to a harmonica, and a second portion secures to a shaft that co-rotates with one of the gears, which are housed within the yoke. A wireless foot pedal controls the motor to drive the gears to rotate to thereby rotate the harmonica between a first position and a second position. The motor and gear arrangement is particularly configured to provide friction and a stall torque that holds the harmonica support member in an upright position even while the user is playing the harmonic, without using a dedicating locking mechanism. An encoder detects rotation speed and rotation angle of the motor to control the motor to limit movement of the harmonica support member to at least the first and second positions.

Systems and methods for forming holes in a ground cover material as a vehicle travels over terrain. The methods comprise: detecting when a mobility mechanism of the vehicle or a machine coupled to the vehicle has moved in a direction by a certain amount; generating a control signal by a controller responsive to said detecting; communicating the control signal from the controller to a heat source; producing heat by the heat source in response to the control signal; and using the heat to form a hole in the ground cover material as the vehicle travels at a speed over the terrain.