Miditech MIDI controller keyboard - Pitch and Modulation Wheels; Pitch Bend Wheel Operation; Modulation Wheel Operation

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Use of the Pitch Bend-Wheel:
Roll upward the pitch Bend wheel wheel to increase the pitch or roll
downward the wheel to lower the pitch smoothly by transmitting pitch
bend message ranging of 0 to 127. Normally, the wheel stays on its
centre position, i.e. no bending.
Use of the Modulations-Wheel:
Roll upward Modulation wheel to add modulation effect ranging of 0
to 16383. The resolution of transmitted data is 128 bit. When the
wheel stays on its lowest position, no modulation message is
transmitted.