From the course: Learning Modular Synthesis
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Filter resonance (feedback)
From the course: Learning Modular Synthesis
Filter resonance (feedback)
- Let's play around with another way that we can change a filter's response, namely by playing with its resonance. Resonance is feedback inside a filter, the output coming back to the input. The result is the harmonics, right around that cutoff, the corner frequency, gets strengthened rather than the ones beyond just being reduced. You get a strange vocalish vowelish sound as a result. It's a very distinctive sound, I'm sure you've heard before. Also what's interesting is resonance is different from filter to filter. Some of them go into strange distortion, some of them actually start oscillating and become a sine wave all by themselves. Let's play around with resonance on our two filters here and compare their differences and also see what happens to the harmonics as we play with resonance. I've already set up a simple patch with two oscillators going into the Roland filter to start off with, gate triggering both of our envelopes, one of them patched to modulate the filter's cutoff…
Contents
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Patching a typical synthesizer “voice”9m 3s
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Tuning voltage-controlled oscillators (VCOs)8m 48s
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The basic analog waveforms6m 23s
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Sine waves and drum sounds8m 36s
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Digital wavetable oscillators10m 19s
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The voltage controlled low-pass filter (VCF)8m 30s
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The difference between filter slopes7m 45s
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Filter resonance (feedback)7m 50s
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Other common filter modes (HP, BP, and Notch)9m 13s
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Envelope types (ADSR, AD, AR, and DADSR)8m 44s
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Linear vs. exponential envelope shapes7m 59s
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Low-frequency oscillator (LFO) waveshapes4m 14s
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Pulse width modulation (PWM)3m 7s
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Vibrato with LFO sync and delay4m 30s
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Tremolo and voltage-controlled amplifiers (VCAs)4m 52s
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Some alternate modulation sources4m 13s
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