Edit study-random-filter-drops

Admin tokenpatch.def

(patch
  (canvas (width 4080) (height 5028)
    (background "/assets/serge_symbolic_joined.svg"))

(point audio.aux-in 4004 2703 audio "Audio Interface AUX IN")
  (point cvpro.in1 2642 1956 audio "Edelweiss left Mix Pro IN 1")
  (point cvpro.out 2642 1776 audio "Edelweiss left Mix Pro OUT")
  (point gtostep.in 705 2226 audio "Dual GTO left Stepped IN")
  (point gtostep.out 705 2405 audio "Dual GTO left Stepped OUT")
  (point gtostep.sample 645 2180 audio "Dual GTO left Stepped SMPL")
  (point gtsa.end-out 2865 2794 audio "GTS XL upper END OUT")
  (point gtsa.out 2865 2613 audio "GTS XL upper OUT")
  (point gtsa.trig 2865 2884 audio "GTS XL upper TRIG IN")
  (point mixpro2.in1 3486 1956 audio "Edelweiss right Mix Pro IN 1")
  (point mixpro2.out 3486 1776 audio "Edelweiss right Mix Pro OUT")
  (point noise.sh.out 765 2001 audio "Dual GTO S/H source")
  (point vcfq.band.out 1845 99 audio "VCFQ BAND")
  (point vcfq.pitch 1965 459 audio "VCFQ 1V/OCT")
  (point vcfq.trig 1965 369 audio "VCFQ TRIG IN")
  (cable c1 clock gtsa.end-out gtsa.trig
    (label "GTS XL upper END OUT -> GTS XL upper TRIG IN"))
  (cable c2 clock gtsa.end-out gtostep.sample
    (label "GTS XL upper END OUT -> Dual GTO left Stepped SMPL"))
  (cable c3 clock gtsa.out vcfq.trig
    (label "GTS XL upper OUT -> VCFQ TRIG IN"))
  (cable c4 audio noise.sh.out gtostep.in
    (label "Dual GTO S/H source -> Dual GTO left Stepped IN"))
  (cable c5 audio gtostep.out cvpro.in1
    (label "Dual GTO left Stepped OUT -> Edelweiss left Mix Pro IN 1"))
  (cable c6 pitch cvpro.out vcfq.pitch
    (label "Edelweiss left Mix Pro OUT -> VCFQ 1V/OCT"))
  (cable c7 audio vcfq.band.out mixpro2.in1
    (label "VCFQ BAND -> Edelweiss right Mix Pro IN 1"))
  (cable c8 audio mixpro2.out audio.aux-in
    (label "Edelweiss right Mix Pro OUT -> Audio Interface AUX IN"))
)

notes.md

# Randomly pitched filter drops

A sampled voltage retunes the VCFQ between pings. Pitch changes are independent draws, not a random walk.

## Start here

Lower the monitoring level before patching. These are documented patch designs, not claims of hardware audition.

Unless this recipe uses the right Mix Pro for control voltage: center its DC offset, zero unused channels, and bring up only the cabled audio inputs. Connect Audio Interface MIX OUT to your normal monitoring chain.

1. GTS upper: 1–2 Hz with fast RISE. GTO left Stepped: cycle off, SMPL up, RATE fast.
2. Left Mix Pro: zero offset and a small positive input gain. VCFQ: audio range, Q high enough to ring, FREQ in the low-mid range.

## Cables

1. GTS XL upper END OUT → GTS XL upper TRIG IN.
2. GTS XL upper END OUT → Dual GTO left Stepped SMPL.
3. GTS XL upper OUT → VCFQ TRIG IN.
4. Dual GTO S/H source → Dual GTO left Stepped IN.
5. Dual GTO left Stepped OUT → Edelweiss left Mix Pro IN 1.
6. Edelweiss left Mix Pro OUT → VCFQ 1V/OCT.
7. VCFQ BAND → Edelweiss right Mix Pro IN 1.
8. Edelweiss right Mix Pro OUT → Audio Interface AUX IN.

## Listen for

A stream of plinks with changing resonant pitch. Very long rings can bend when the next pitch sample arrives.

## Play it

Reduce the clock speed and increase Q for isolated resonant events.

## If it misbehaves

If the pitch range is extreme, reduce the left Mix Pro gain before retuning the filter.

## Module references

- https://serge-modular.com/docs/RandomSource_Serge_VCFQ.pdf
- https://serge-modular.com/docs/Serge%20Dual%20GTO%20user%20manual.pdf

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