Dark Energy III is a fully analog monophonic synthesizer with Midi and USB interface.
Essentially it's an enhanced version of the Dark Energy II. These are the main differences between Dark Energy II and III:

• VCO has in addition the triangle waveform available
• no heat-up period of the VCO
• min. eight octaves perfect 1V/octave tracking of the VCO
• separate reset inputs for the two LFOs
• improved ADSR
• access to additional functions via pin headers inside the unit for DIY modifications (e.g. linear FM, hard/soft sync)

The filter is the same as the Dark Energy II and all other not mentioned functions are the same compared to Dark Energy II