Ed Myrol

Many digital synthesizers attempt to mimic analog systems while avoiding aliasing artifacts typical to basic digital interpretations of analog waveforms.

Ed Myrol avoids certain artifacts by producing only frequencies that are an exact number of audio samples long. This limitation produces notes that are not necessarily in tune. To bring the pitches back into line, each voice has a rudimentary delay-based pitch shifter.

This is a very silly way to avoid aliasing. It is CPU Intensive. Depending on the phase of the pitch shifter, the onset of notes can be delayed. The pitch shifters generate glitches and artifacts of their own, the intensity of which vary across the range of notes. The payoff for being patient with these issues is an unusual character of sound.

We’re used to the ugly artifacts of pitch shifters processing polyphonic material. It turns out that using a separate shifter to process each voice results in complementary and interesting artifacts. The character changes depending on the degree of shift. It’s interesting to set the pitch shift to an arbitrary value and compensate by transposing the midi input. Pitch modulation such as vibrato must target the shifters and so alters the character of the artifacts in time.

Consider Ed Myrol a bizarre alternative to virtual analog synthesis using oversampling or bandlimited oscillators.

150 PM
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  • Category: Synthesizer
  • Revision: 02
  • Views: 670
  • Modified: 2 years ago
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