feat(copycat): bass V-chord pattern, d6 piano, full onset evidence

Major findings from demucs onset analysis:
- NTO bass uses ONLY F2/A2/C2 (V chord tones) — never sits on Bb root!
- Bass is rhythmically alive, not held notes. Varies each 2-bar phrase.
- Guitar(arp) stem evolves: F3/F4 base → Bb3/A3 mid → Gb4/E4 breakdown
- Piano: sparse Bb3 stabs with F3/A3, only in specific sections

Changes:
- d4 bass: rewritten as rhythmic V chord figure (f2/a2/c2 variation)
- d6 piano: NEW — sparse FMRhodes1 stabs, ^31 knob controls density
- d7 cello: reworked as counter-melody (sustained 5ths/3rds)
- d9 pad: fixed cut group collision (was cut 7, now cut 9)

copycat/la_cle_des_champs.tidal

@@ -137,15 +137,15 @@ d3 $ gF1 $ gM -- HATS: h2o sparse offbeat + light flourish
   # pan 0.42
   # n "~ 3 ~ 2 ~ 4 ~ <3!3 [3 6]>" -- occasional open hat flourish
   # gain (1.9 * "~ 0.8 ~ [0.75|0.85] ~ 0.8 ~ <0.9!3 [0.9 0.5]>")
-d4 $ gF2 $ gM3 -- BASS: Deep sub Bb1/F2 (demucs: 58-87Hz)
+d4 $ gF2 $ gM3 -- BASS: V chord tones (F2/A2/C2), rhythmically alive
+  -- onset analysis: NTO bass = ALWAYS F2/A2/C2 (V chord), never sits on Bb!
+  -- hits every ~2 beats with variation, answer at beat 2.7→3.7→next bar 0.2
   $ midiOn "^57" ( -- state: octave ghost echo
     off "e" ((|+ note 12) . (|* gain 0.65) . (# legato 0.3))
     )
   $ midiOn "^89" (struct "[t, [~ t t ~. <t(3,8) t*[2 <2 4>]>]]") -- push: wild mode
-  $ note ( -- V chord answer (A2 C2 F2) at quarter notes — onset analysis confirmed
-    -- root held 5/8 of 2 bars, then A→C→F (harmonic minor V tones)
-    -- answer crosses barline: F2 lands on "the one" of next chord
-    slow 2 $ "<[bf2@5 a2 c2 f2] [f2@5 a2 c2 f2] [bf2@5 a2 c2 f2] [f2@5 f2 c2 c2] [bf2@5 a2 c2 f2] [f2@5 a2 c2 f2] [df2@5 af2 f2 df2] [ef2@5 gf2 ef2 bf1]>"
+  $ note (
+    slow 2 $ "<[f2@5 a2 c2 f2] [c2@5 a2 c2 f2] [f2@5 c2 a2 f2] [a2@5 c2 c2 f2] [f2@5 a2 c2 f2] [c2@5 a2 a2 f2] [f2@5 af2 f2 df2] [f2@5 gf2 ef2 bf1]>"
     )
   # "bassWarsaw"
   # dec 0.3 # sus 0.8
@@ -153,19 +153,20 @@ d4 $ gF2 $ gM3 -- BASS: Deep sub Bb1/F2 (demucs: 58-87Hz)
   # crushbus 42 (range 16 3 "^33")
   # room 0.15
   # gain 1.3
-d5 $ gF3 $ gM3 -- ARPEGGIO: 2-note 16th oscillation (MIDI confirmed)
-  $ midiOn "^90" (stut 4 0.5 "e")
-  $ midiOn "^58" (superimpose ( -- bloom: octave shimmer + pan spread
+d5 $ gF3 $ gM3 -- ARPEGGIO: 2-note 16th, evolves over sections (demucs guitar stem)
+  -- demucs: F3/F4 base, Bb3/A3 mid-sections, Gb4 in Ebm, E4 at breakdown
+  $ midiOn "^90" (stut 4 0.5 "e") -- push: stutter
+  $ midiOn "^58" (superimpose ( -- state: bloom octave shimmer + pan spread
     (|+ note 12) . (|* gain 0.55) . (|+ pan 0.2) . (# room 0.5)
   ))
-  $ sometimesBy (1 - "^18") (mask "<t(11,16) t(13,16) t(14,16) t(15,16)>") -- breathes: sparse → full over 4 bars
-  $ note ( -- Bb stays on top over both Bbm AND F chords (MIDI evidence)
+  $ sometimesBy (1 - "^18") (mask "<t(11,16) t(13,16) t(14,16) t(15,16)>") -- breathes
+  $ note ( -- Bb/F base, same over both chords. Eb/Gb for Ebm section
     "<[bf4 f4]*8!6 [ef4 gf4]*8!2>"
     )
   # "FMRhodes1"
-  # modIndex (range 0.5 8 "^34")
-  # crushbus 51 (range 15 2.8 "^54")
-  # lpfbus 52 (slow 8 $ range 800 6000 sine)
+  # modIndex (range 0.5 8 "^34") -- ^34: FM depth (timbre IS the magic)
+  # crushbus 51 (range 15 2.8 "^54") -- ^54: bitcrush
+  # lpfbus 52 (slow 8 $ range 800 6000 sine) -- auto-filter sweep
   # room 0.35 # sz 0.5 # dry 1.2
   # legato 0.5
   # pan 0.6
@@ -183,8 +184,22 @@ d9 $ gF2 $ gM3 -- PAD: Warm evolving harmonic bed
   # room 0.6 # sz 0.8 # dry 0.9
   # legato 4
   # pan 0.4
-  # cut 7
+  # cut 9
   # gain 0.95
+d6 $ gF2 $ gM3 -- PIANO: Sparse Rhodes stabs (demucs: Bb3 dominant, enters ~40s)
+  -- demucs piano: almost all Bb3 with F3/A3, very sparse, in specific sections
+  $ someCyclesBy "^31" ( -- ^31 mid knob: piano density (0=silent, up=more stabs)
+    struct "<~!4 [~ t ~ ~]!4 [~ t ~ t]!4 [~ t t t]!4>"
+    )
+  $ note (
+    slow 2 $ "<[bf3,f4] [a3,f4] [bf3,f4] [a3,c4] [bf3,f4] [a3,f4] [af3,df4] [gf3,bf3]>"
+    )
+  # "FMRhodes1"
+  # modIndex 1.5
+  # room 0.3 # sz 0.4 # dry 1
+  # legato 0.8
+  # pan 0.5
+  # gain 1.2
 d7 $ gF3 $ gMute3 -- CELLO: Counter-melody, sustained bowed (second melodic voice)
   $ midiOn "^91" (ply 2) -- push: doubles for urgency
   $ midiOn "^59" ((|* gain 1.2) . (# "[cpluck:6,cpluck:7]")) -- state ON: pizzicato