The successor of the good old A-111 High End oscillator is an utterly precise analogue VCO / LFO with an extremely big frequency range, immaculate tracking over at least ten octaves and nearly perfect waveforms. With linear and exponential FM, pulse width modulation, two simultaneous types of sync and attenuators on all CV inputs, the module is really well-appointed.

Here are the most important features of the module:

triangle core (i.e. all other waveforms are derived from the triangle by waveshapers)
fully analog design
min. 15 octaves pitch range (typ. 0.5Hz - 20kHz in VCO mode / 0.001Hz - 40Hz in LFO mode)
perfect 1V / octave tracking over min. 10 octaves, typ. 20Hz - 20kHz (control LF has to be fully CW for perfect 1V / octave tracking)
exponential frequency controls and inputs:
Tune: range can be selected by means of a jumper, about + / - 1 octave (jumper JP6 not installed) or about + / - 3 octaves (jumper JP6 installed)
Fine: about + / - 1 semitone range
Octave: range switch with 6 positions for 6 octaves
1V / octave CV input
XFM input with attenuator
access to internal bus CV (via jumper, optional, please remove the bus jumper if this feature is not used to avoid unwanted frequency modulation as then the unused CV line of the bus works as a kind of antenna)
linear frequency controls and inputs:
LF (manual linear frequency control: fully CW = standard setting for usual VCO applications, fully CCW: close to 0Hz frequency) works also as a kind of range control for the exponential section but for standard VCO applications with 1V / octave control voltage the LF control should be fully CW !
LFM input with attenuator, DC coupled
Pulsewidth controls and inputs (for rectangle output):
PW (manual pulsewidth control from 0% / output = fixed at "low" state up to 100% / output fixed at "high" state)
PWM input with attenuator
Hard Sync input (CEM3340 hard sync type)
Soft Sync input
Waveform outputs:
Sawtooth, output level ~ 10Vpp (voltage range ~ 0 ... +10V)
Rectangle (controlled from pulsewidth section), output level ~ 10Vpp (voltage range ~ 0 ... +10V)
Triangle (output level ~ 10Vpp, voltage range ~ -5V ... +5V)
Sine (output level ~ 10Vpp, voltage range ~ -5V ... +5V)
Range switch to select VCO / VCLFO mode, frequency relation between VCO mode and LFO mode about 500 : 1
dual color LED display (to display low frequencies below ~ 25 Hz)
Nearly "perfect" waveforms
high end triangle to sine converter with excellent sine waveshape (thank's to Tim Stinchcombe who recommended this circuit)
the micro precision VCO A-111-3 uses the same VCO core as the A-111-2, but has less inputs, outputs and controls