Miditech MidiStudio 2 User Manual page 9

PITCH BEND WHEEL
Roll upward PITCH BEND wheel to increase the pitch or roll downwards the
wheel to lower the pitch smoothly by transmitting pitch bend message ranging
of 0 to 16383. Normally, the wheel stays on its centre position, i.e. no bending.
MODULATION WHEEL
Roll upward MODULATION wheel to add modulation effect ranging of 0 to
127. When the wheel stays on its lowest position, no modulation message is
transmitted.