From the course: Learning Modular Synthesis
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The difference between filter slopes
From the course: Learning Modular Synthesis
The difference between filter slopes
- Not all filters sound the same. That's why it's quite common to have more than one type of filter inside your modular synth. We're going to explore those differences in the next couple of movies. One common difference is the slope of your filter, how strongly it filters out frequencies beyond the corner or cutoff frequency. They're usually defined in terms of decibels per octave. For example, the 24 decibel per octave slope on a filter means that when you get one octave higher than the cutoff frequency, those harmonics have been reduced in strength by 24 decibels, or 24 dB. On the other hand, a 12 decibel per octave cutoff means that when you get one octave beyond the cutoff, those harmonics are only reduced 12 dB, not as strongly. Sometimes you'll hear this referred to as the number of poles a filter has. This kinda gets into the electronics inside a filter, but in short, one pole equals six dB of cutoff. So, a 2-pole filter has 12 dB per octave slope, and a 4-pole filter has 24 dB…
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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