Using the Behringer Poly D synthesizer is a breeze. First, power it on and start exploring the 37 semi - weighted keys. You can choose different modes like mono, unison, or polyphonic to create various sounds. Adjust the oscillator shapes and pulse widths to get the sound you want. The sequencer is easy to use, just set your steps and locations. The arpeggiator can add great effects to your music. For external sound sources, use the external audio input. When it comes to maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. Check the connections regularly to make sure everything is working properly. And always follow the MIDI channel and Voice Priority settings according to your needs. Have fun creating amazing music with your Poly D!