A power converting apparatus includes a main inverter having a high-voltage DC power supply that operates at a low frequency employing SiC MOSFETs having a high withstand voltage exceeding 600 V and a sub-inverter having a low-voltage capacitor that operates through high-frequency PWM employing Si MOSFETs having a low withstand voltage. In some embodiments, synchronization is implemented by receiving an indication to activate a selected machine of a group of sync-aware machines connected to a subnet of a network, where each member of the group has information identifying all members of the group. The step of requesting can include enabling a paging agent to generate additional redirection messages and directing packets from correspondent nodes to a paging agent. This variable swing motion is mechanically extracted and cycled through the transmission to progressively compound the combined motions to modify and sustain user-selected, infinitely variable, output speeds. The system further includes an image display system with stored data for displaying images to a person using the apparatus training andor therapy purposes.