OR-0040
Yumeo
Japan · 1985 – c. 2005
Ser. F-0092233
1991 · effect
Issued as VST3 · AU
Restored 2026 from 1991 hardware.
Yumeo HF-1 — Sampler Filter
Yumeo HF-1 · resonant filter unit · restored from unit no. F-0092233 · Yumeo, Japan, 1991
The restorer's note
The onboard filter of a consumer digital instrument, offered two ways: smooth analog warmth, or the zipper of an early digital IIR sweeping in coarse steps. Both are original behaviours. Here the zipper is a feature, as it never was there.
Acquisition
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The plate
Listening
Listening
Demonstration recordings, prepared at the bench.
The ladder, plainly
Chords through the Analog Ladder: dry, then filtered at 400 Hz, then Cutoff swept up to 8 kHz and back down with Resonance at 45 %. The sampler's front panel, doing its plain job.
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Three filters
Resonance at 80 % while Cutoff sweeps; Type steps Analog Ladder, Analog SVF, Digital IIR — the same move, three tempers.
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The zipper
Smoothing at nought, Drive at 80 %. Cutoff moves in deliberate steps — an A-minor arpeggio of corner frequencies — and every step clicks. In Digital IIR, un-smoothed, that zipper is the point.
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