The Octopus' 2 Filters permit using the filters as modulation sources; thus they can be used to modulate an oscillator—the sonic possibilities are tremendous.

Specification
    Flexible, Matrix-based Frequency Modulation synthesis
    Oscillator Matrix with 10 modulation sources and  8 modulation destinations
    550 presets sounds in a wide range of styles made by Nico Herz, Summa, Tim Conrardy and others
    Full cross-modulation, adjustable feedback for every oscillator
    8 additive oscillators using sample-based or user defined waveforms
    Two independent multimode filters, available as FM sources
    Up to 32 envelopes with multiple, syncable segments, freerun, loop and adjustable slopes
    Graphical envelope editor with sophisticated  editing functions
    Envelopes can be used to modulate a wide range of  parameters including amplitude, mix, panning, pitch, frequency, phase, cutoff and resonance of filters
    Stereo effects section with 4 effects (Parametric EQ, Chorus, Delay and Reverb)
    Two step sequencers each with up to 32 steps each 24 voice polyphonic