"The Essential" Triwave:

Two tone generators (VCO's), each with:
Pitch: center frequency from rumbling low to hissing high
Tone: select harsh square-wave or smooth triangle-wave
Three LFO's (low frequency oscillators), each with:
Speed: rate of change of each pitch channel
Depths (2 knobs per LFO): Amount of pitch modulation on each VCO
Mix: blend between tone channels
Volume: output level
All of the above, plus...
Waveshaper: (3 knobs) blend each LFO from square to triangle
Symmetry: blend each LFO from sawtooth ramp-up to triangle to sawtooth ramp-down, or variable duty-cycle rectangle wave, a knob per LFO
Ring mod: adds an input jack and sensitivity control for ring modulation effect
Dual cross modulation: (2 knobs) frequency modulate each channel with the other
True-bypassed with LED indicator (3PDT stomp).
9VDC powersupply included (USA orders).
Die-cast 7"x7" aluminum box.