You need the real hardware synthesizer which the editor is made for. If PRO upgrade is available, hardware is not required. List for requirements:

1. You need the real hardware synth, which the editor is made for.
2. 32/64-bit AudioUnit / VST host for Mac or PC.
3. MIDI interface. A good one which supports SysEx messages. Don’t buy anything which is less than 50€.
4. Direct MIDI in / out connection between your synth and the MIDI interface. No MIDI Thru connections or MIDI in only / MIDI out only connections.
5. Audio cables from the synth to soundcard or mixer in order to hear the sound.
6. At least 1600×1024 pixels resolution.