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Help from Synthesis Guru Needed


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I am reading the articles in SOS on synth secrets. I am stuck with chapters on filters.

A few questions I cannot naswer are:

1. Why combining 2 same sawtooths with 180 degree phase shift results in cancelling odd numbered harmonics and reinforcing even numbered harmonics?

2. Why when combining two complex signals with a given offset each frequency is phase shifted by a different and not same amount?

3. I am not quite sure that I got it right with the phase response concept.

Can anyone help me answer on these questions?

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