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Hello! I have reviewed the user manual for the erica synths PICO VCF1 filter. This document describes a filter designed for generating specific types of sounds and detailed the controls for adjusting the cutoff frequency, resonance, and mode switch. It also provides information about the use of rare Russian op-amps and protection circuits. I'm ready to answer your questions about its use.
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What modes does the filter have?
Can the filter self-oscillate?
What kind of op-amps are used in the filter?