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"3 step Switch to change LFO speed range from low to medium to very high
Rotary knob that changes Pulse Width Modulation source - I dont know what the sources are but it sounds different in character as you switch
External audio jack switch and amount knob
Overdrive which adds distortion
FM Source with associated Amount knob which changes the tone to more metallic as you expect for FM
There are also two jacks LFO Ext and VCF Ext which may be input modulation sources for the LFO and VCF so you can connect to a modular system for example and run your own wave forms through this synth and take advantage of its filter and so forth
When you turn the LFO Ext switch it disconnects the internal LFO so the jack must be for an external LFO input
Suffice to say the mods add a whole new dimension to the well known sound of this classic synth."
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