**Additive and Subtractive Synthesis** - where frequencies (Frequency Modulation) and amplitudes (Amplitude Modulation) of tones can be added or subtracted to form new tones. Also called Interference or Interference, constructive and destructive.

See Also

**Amplitude Modulation**
**Comb Filter**
**Figure 1.12 - Naturally Occurring Frequencies Modes and Music Interval Relations**
**Figure 8.5 - Summation Tones**
**Figure 14.01 - Overtones Developed Musically Showing Up as Isotopes along the Vertical Axis of this Chart**
**Frequency Modulation**
**gravity multiplication**
**Interference, constructive and destructive**
**law of augmentation and multiplication of force**
**Law of Cycles**
**Law of Harmonic Pitch**
**Law of Harmonic Vibrations**
**multiplication of resistant pressure**
**Overtone Series**
**Power multiplication**
**Power of Beat Harmonics**
**Resistance**
**Summation Tone**
**synthesis**
**8.17 - Law of Harmonic Vibrations**
**8.22 - Law of Harmonic Pitch**
**1.23 - Power of Harmonics through Summation Tones**