| You need an ADSR filter with medium-short attack, medium, decay, medium-short sustain, medium release (about where the decay is set), and an LFO to do the longer sweep. Two detuned saw waves and a sine wave an octave below.
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FS: Pigtronix Philosopher's Tone - $105 Shipped
FS: DOD FX-25 (original, no battery cover) - $40
FS: PEAK PGR4 MIDI-Controllable Bypass Looper - $120
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