# Classic Rock — John Bonham / AC/DC style
# Reference: "When the Levee Breaks" (Bonham), "Back in Black" (Phil Rudd)
# GM notes: 36=kick, 38=snare, 42=closed HH, 49=crash, 48=hi tom, 45=mid tom, 41=floor tom

#
# ── Step grid notation ────────────────────────────────────────────────────────
# Each character in a step grid represents one subdivision of the bar.
# Resolution controls how many steps per bar (16 = 16th notes in 4/4; 12 = 16th notes in 6/8).
#
#   X   Strong accent  — velocity = base_velocity × 1.00  (full hit / downbeat)
#   x   Medium accent  — velocity = base_velocity × 0.75  (firm stroke / upbeat)
#   o   Soft hit       — velocity = base_velocity × 0.55  (brush / light touch)
#   g   Ghost note     — velocity = base_velocity × 0.28  (barely audible, mostly felt)
#   .   Rest           — no note fired at this step
#
# Beat positions — 4/4 at resolution 16 (one char per 16th note):
#   pos  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
#        1  e1 +1 a1  2  e2 +2 a2  3  e3 +3 a3  4  e4 +4 a4
#   (1/+/2/+/3/+/4/+ = quarter beats; e = "e of"; a = "and-a of")
#
# Beat positions — 6/8 at resolution 12 (one char per 16th note):
#   pos  0  1  2  3  4  5  6  7  8  9 10 11
#        C1 .  e1 .  a1 .  C2 .  e2 .  a2 .
#   (C1/C2 = compound beat downbeats; each compound beat = 3 eighth notes = 6 steps)
#
# Swing / feel: the 'feel' field shifts odd-indexed steps (1,3,5,7…) forward in time.
#   straight   — no shift (all steps exactly on the grid)
#   swing_soft — odd steps delayed ~16 % of a step (light swing)
#   swing_hard — odd steps delayed ~34 % of a step (jazz/shuffle triplet feel)
#   laid_back  — same as straight with slower humanisation envelope
# ─────────────────────────────────────────────────────────────────────────────

name: Classic Rock
family: rock
bpm_range: [80, 160]
time_signature: [4, 4]
resolution: 16
feel: straight

instruments:
  kick:    { note: 36, base_velocity: 110, velocity_range: 10, timing_jitter: 0.012, duration_beats: 0.15 }
  snare:   { note: 38, base_velocity: 105, velocity_range: 15, timing_jitter: 0.018, duration_beats: 0.12 }
  hihat:   { note: 42, base_velocity: 82,  velocity_range: 12, timing_jitter: 0.012, duration_beats: 0.07 }
  crash:   { note: 49, base_velocity: 100, velocity_range: 8,  timing_jitter: 0.010, duration_beats: 0.25 }
  tom_hi:  { note: 48, base_velocity: 95,  velocity_range: 15, timing_jitter: 0.018, duration_beats: 0.12 }
  tom_mid: { note: 45, base_velocity: 90,  velocity_range: 15, timing_jitter: 0.018, duration_beats: 0.12 }
  tom_lo:  { note: 41, base_velocity: 90,  velocity_range: 15, timing_jitter: 0.018, duration_beats: 0.15 }

humanization:
  timing_jitter: 0.015
  velocity_jitter: 12
  velocity_drift: 0.05

sections:
  intro:
    type: count_in
    hits: 4
    note: 37

  groove:
    bars: 1
    variations:
      - name: bonham
        weight: 4
        # Kick on beat 1 (pos 0), "and of 2" (pos 6), beat 3 (pos 8), "and of 4" (pos 14)
        # The signature Bonham driving groove from "When the Levee Breaks"
        kick:  "X.....X.X.....X."
        snare: "....X.......X..."
        hihat: "X.x.X.x.X.x.X.x."
      - name: acdcdc
        weight: 2
        # Phil Rudd / AC/DC: kick on beats 1 and 3 only — locked-in and relentless
        kick:  "X.......X......."
        snare: "....X.......X..."
        hihat: "X.x.X.x.X.x.X.x."
      - name: bonham_push
        weight: 1
        # Bonham variation: extra kick "a of 4" (pos 15) pushing hard into the next bar
        kick:  "X.....X.X......X"
        snare: "....X.......X..."
        hihat: "X.x.X.x.X.x.X.x."

  fill:
    bars: 1
    variations:
      - name: tom_descend
        # Classic rock fill: kick on beat 1, crash/snare accent then descending toms
        kick:    "X..............."
        snare:   "....X..........."
        tom_hi:  "......X.X......."
        tom_mid: "..........X.X..."
        tom_lo:  "..............XX"
      - name: snare_run
        # Snare-heavy fill: accent on beat 2 then fast snare/tom run to the end
        snare:   "....X...X.X.X.X."
        tom_lo:  "..............X."
        kick:    "X..............."

  break:
    bars: 2
    variations:
      - name: drop
        kick: "X..............."

  crash:
    bars: 1
    variations:
      - name: standard
        crash: "X..............."
        kick:  "X..............."
        hihat: "X.x.X.x.X.x.X.x."

structure:
  fill_every: 8
  break_every: 0
  break_length: 1
  crash_after_fill: true
  dynamic_build: true