A meditation on two tones combined with different modulations.  The tones are heard separately, mixed additively, ring modulated, linear frequency modulated, and linear through-zero frequency modulated.  A MOTM-300 VCO provides the low sinewave; the ZerOscillator the higher triangle wave.  The ZO modulates the MOTM for linear FM, and the MOTM modulates the ZO for through-zero FM.  Two MOTM-190 VCA modules control the depth and output levels, and do the ring modulation.  A MOTM/Oakley 820 provides a slow envelope.  I mixed the sequence in real time.  There are no filters or digital effects.

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