FILTER SECTION  

• As with the 20 and the 50, the Filter in the MS-10 is fairly straight forward…that's not to say, however, that it doesn't sound great. The warmth added to any patch by careful filter setting really defines the characteristic sound of this instrument.
• What is generally referred to as "resonance" on other synthesizers (or "emphasis" in the Moog world) is called "Peak" on the MS-10. Basically, this controls the amount of emphasis given the frequencies closest to the cutoff frequency (as set, obviously, by the Cutoff Frequency pot). When the PEAK control is turned all the way up, it achieves what is called self-oscillation. In other words, it produces a tone on its own, sounding something like this. (Note that the tone in question is the high tone being swept over the low F--with the MS-10 it is not possible to disable the oscillator to hear just the filter).
• The filter can be modulated by the LFO (Modulation Generator), AND by EITHER the Envelope Generator, or by a patched (external) input (as above, the second control knob is dual purpose). As with the VCO, MG modulation is fixed to ramp/triangle wave. To modulate with a square wave, the patch panel must be used. Actual FM (modulation source in the audio range) is achievable via the external input, provided one has an oscillator that can be patched into it (e.g. from an MS-50 or any modular).

• VCF cutoff frequency modulation with slow triangle wave (MG).
• VCF cutoff frequency modulation with the envelope generator.
• VCF cutoff frequency modulation with the inverse output of the envelope generator--EG "Rev Out" patched to VCF "Cutoff Freq" input.

VCF cutoff frequency modulation with external VCO (FM)--MS-50 4' ramp wave patched to VCF "Cutoff Freq" input, as Filter Cutoff Frequency knob is swept.

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