diff --git a/scripts/compose_full_track.py b/scripts/compose_full_track.py
new file mode 100644
index 0000000..3d4e922
--- /dev/null
+++ b/scripts/compose_full_track.py
@@ -0,0 +1,239 @@
+#!/usr/bin/env python
+"""compose_full_track.py — Genera un FLP reggaeton completo de 2:30."""
+
+from pathlib import Path
+
+# ── resolve project root ──────────────────────────────────────────────────────
+PROJECT = Path(__file__).resolve().parents[1]
+import sys
+sys.path.insert(0, str(PROJECT))
+
+from src.selector import SampleSelector
+from src.composer.melodic import bass_tresillo, lead_hook, pad_sustain
+from src.flp_builder.schema import (
+    SongDefinition, SongMeta, PatternDef, ArrangementTrack,
+    ArrangementItemDef, MelodicTrack, MelodicNote
+)
+from src.flp_builder.builder import FLPBuilder
+
+# ── timing ────────────────────────────────────────────────────────────────────
+BPM = 95
+KEY = "Am"
+BARS_TOTAL = 60
+BAR_DURATION_S = 4 / BPM * 60          # 2.526s/bar
+SONG_DURATION_S = BARS_TOTAL * BAR_DURATION_S
+SONG_DURATION_M = int(SONG_DURATION_S // 60), int(SONG_DURATION_S % 60)
+
+print(f"Target: {BARS_TOTAL} bars @ {BPM} BPM = {SONG_DURATION_M[0]}:{SONG_DURATION_M[1]:02d}")
+
+# ── sample selector ────────────────────────────────────────────────────────────
+sel = SampleSelector()
+
+def pick(role, **kwargs):
+    """Select best sample, log warning if missing."""
+    m = sel.select_one(role=role, bpm=BPM, **kwargs)
+    if m:
+        return m.get("new_name") or m.get("original_name"), m.get("original_path") or ""
+    print(f"  [WARN] No sample for role='{role}' {kwargs}")
+    return None, None
+
+# Drum channels (10-16)
+ch10_perc,   path10 = pick("perc")
+ch11_kick,   path11 = pick("kick")
+ch12_snare,  path12 = pick("snare")
+ch13_rim,    path13 = pick("perc")          # fallback to perc
+ch14_perc2,  path14 = pick("perc", character="aggressive")
+ch15_hihat,  path15 = pick("hihat")
+ch16_clap,   path16 = pick("snare", character="aggressive")
+
+print("Drum samples:")
+for ch, name in [(10, ch10_perc),(11, ch11_kick),(12, ch12_snare),
+                 (13, ch13_rim),(14, ch14_perc2),(15, ch15_hihat),(16, ch16_clap)]:
+    print(f"  ch{ch}: {name}")
+
+# Melodic samples
+ch17_bass_path  = sel.select_one(role="bass", key=KEY, bpm=BPM, character="deep")["original_path"]
+ch18_lead_path  = sel.select_one(role="lead", key=KEY, bpm=BPM, character="bright")["original_path"]
+ch19_pad_path   = sel.select_one(role="pad",  key=KEY, bpm=BPM, character="warm")["original_path"]
+ch20_pluck_path  = sel.select_one(role="pluck", key=KEY, bpm=BPM, character="warm")["original_path"]
+
+print(f"\nMelodic samples:")
+for ch, path in [(17, ch17_bass_path),(18, ch18_lead_path),(19, ch19_pad_path),(20, ch20_pluck_path)]:
+    print(f"  ch{ch}: {Path(path).name}")
+
+# ── helpers ───────────────────────────────────────────────────────────────────
+def section_notes(generator_fn, key, bars, start_bar, **kwargs):
+    """Generate notes from a melodic generator, offset to start_bar."""
+    raw = generator_fn(key, bars=bars, **kwargs)
+    return [
+        MelodicNote(
+            pos=n["pos"] + start_bar * 4.0,
+            len=n["len"],
+            key=n["key"],
+            vel=n["vel"]
+        )
+        for n in raw
+    ]
+
+def place_items(pattern_id, start_bar, total_bars, track_idx, pat_bars=4):
+    """Generate ArrangementItemDefs to fill total_bars with pat_bars chunks."""
+    items = []
+    for b in range(0, total_bars, pat_bars):
+        items.append(ArrangementItemDef(
+            pattern=pattern_id,
+            bar=start_bar + b,
+            bars=pat_bars,
+            track=track_idx,
+        ))
+    return items
+
+# ── melodic notes (only in sections where they play) ─────────────────────────
+print("\nGenerating melodic notes...")
+
+# Bass: verse1, chorus1, verse2, chorus2 (not intro/outro)
+bass_notes = (
+    section_notes(bass_tresillo, KEY, 12, 8,  octave=3) +
+    section_notes(bass_tresillo, KEY, 12, 20, octave=3) +
+    section_notes(bass_tresillo, KEY, 12, 32, octave=3) +
+    section_notes(bass_tresillo, KEY, 12, 44, octave=3)
+)
+print(f"  Bass: {len(bass_notes)} notes")
+
+# Lead: chorus1 + chorus2 only
+lead_notes = (
+    section_notes(lead_hook, KEY, 12, 20, octave=5) +
+    section_notes(lead_hook, KEY, 12, 44, octave=5)
+)
+print(f"  Lead: {len(lead_notes)} notes")
+
+# Pad: verse1, chorus1, verse2, chorus2
+pad_notes = (
+    section_notes(pad_sustain, KEY, 12, 8,  octave=4) +
+    section_notes(pad_sustain, KEY, 12, 20, octave=4) +
+    section_notes(pad_sustain, KEY, 12, 32, octave=4) +
+    section_notes(pad_sustain, KEY, 12, 44, octave=4)
+)
+print(f"  Pad: {len(pad_notes)} notes")
+
+# Pluck: verse1 + verse2 (harmonic fill)
+pluck_notes = (
+    section_notes(lead_hook, KEY, 12, 8,  octave=5, density=0.4) +
+    section_notes(lead_hook, KEY, 12, 32, octave=5, density=0.4)
+)
+print(f"  Pluck: {len(pluck_notes)} notes")
+
+# ── SongDefinition ─────────────────────────────────────────────────────────────
+meta = SongMeta(bpm=BPM, key=KEY, title=f"Reggaeton Full {SONG_DURATION_M[0]}:{SONG_DURATION_M[1]:02d}")
+
+patterns = [
+    PatternDef(id=1,  name="kick_sparse",  instrument="kick",   channel=11, bars=4, generator="kick_sparse_notes", velocity_mult=0.7),
+    PatternDef(id=2,  name="kick_main",    instrument="kick",   channel=11, bars=4, generator="kick_main_notes"),
+    PatternDef(id=3,  name="snare_main",   instrument="snare",  channel=12, bars=4, generator="snare_verse_notes"),
+    PatternDef(id=4,  name="hihat_main",   instrument="hihat",  channel=15, bars=4, generator="hihat_16th_notes"),
+    PatternDef(id=5,  name="clap_main",    instrument="clap",   channel=16, bars=4, generator="clap_24_notes"),
+    PatternDef(id=6,  name="perc_main",    instrument="perc",   channel=10, bars=4, generator="perc_combo_notes"),
+    PatternDef(id=7,  name="perc2_main",  instrument="perc",   channel=14, bars=4, generator="perc_combo_notes"),
+    PatternDef(id=8,  name="hihat_intro",  instrument="hihat",  channel=15, bars=4, generator="hihat_8th_notes",  velocity_mult=0.8),
+]
+
+tracks = [
+    ArrangementTrack(index=1, name="Kick"),
+    ArrangementTrack(index=2, name="Snare"),
+    ArrangementTrack(index=3, name="HiHat"),
+    ArrangementTrack(index=4, name="Clap"),
+    ArrangementTrack(index=5, name="Perc"),
+    ArrangementTrack(index=6, name="Perc2"),
+]
+
+# ── arrangement items ──────────────────────────────────────────────────────────
+items: list[ArrangementItemDef] = []
+
+# INTRO (0-7): kick sparse + hihat 8th
+items += place_items(1, 0,  8, 1)   # kick sparse
+items += place_items(8, 0,  8, 3)   # hihat intro (8th notes)
+
+# VERSE 1 (8-19): kick, snare, hihat, perc (no clap)
+items += place_items(2, 8,  12, 1)  # kick main
+items += place_items(3, 8,  12, 2)  # snare
+items += place_items(4, 8,  12, 3)  # hihat
+items += place_items(6, 8,  12, 5)  # perc1
+items += place_items(7, 8,  12, 6)  # perc2
+
+# CHORUS 1 (20-31): all drums
+items += place_items(2, 20, 12, 1)  # kick
+items += place_items(3, 20, 12, 2)  # snare
+items += place_items(4, 20, 12, 3)  # hihat
+items += place_items(5, 20, 12, 4)  # clap
+items += place_items(6, 20, 12, 5)  # perc1
+items += place_items(7, 20, 12, 6)  # perc2
+
+# VERSE 2 (32-43)
+items += place_items(2, 32, 12, 1)  # kick
+items += place_items(3, 32, 12, 2)  # snare
+items += place_items(4, 32, 12, 3)  # hihat
+items += place_items(6, 32, 12, 5)  # perc1
+items += place_items(7, 32, 12, 6)  # perc2
+
+# CHORUS 2 (44-55)
+items += place_items(2, 44, 12, 1)  # kick
+items += place_items(3, 44, 12, 2)  # snare
+items += place_items(4, 44, 12, 3)  # hihat
+items += place_items(5, 44, 12, 4)  # clap
+items += place_items(6, 44, 12, 5)  # perc1
+items += place_items(7, 44, 12, 6)  # perc2
+
+# OUTRO (56-59): kick sparse + hihat
+items += place_items(1, 56, 4, 1)   # kick sparse
+items += place_items(8, 56, 4, 3)   # hihat intro (8th notes)
+
+print(f"\nArrangement: {len(items)} items placed")
+
+# ── melodic tracks ─────────────────────────────────────────────────────────────
+drum_pattern_count = len(patterns)   # 8
+
+melodic_tracks = [
+    MelodicTrack(role="bass",  sample_path=ch17_bass_path, notes=bass_notes,   channel_index=17, volume=0.85, pan=0.0),
+    MelodicTrack(role="lead",  sample_path=ch18_lead_path, notes=lead_notes,   channel_index=18, volume=0.75, pan=0.15),
+    MelodicTrack(role="pad",   sample_path=ch19_pad_path,  notes=pad_notes,    channel_index=19, volume=0.55, pan=0.0),
+    MelodicTrack(role="pluck", sample_path=ch20_pluck_path, notes=pluck_notes,  channel_index=20, volume=0.65, pan=-0.1),
+]
+
+# samples dict for skeleton loader
+samples = {
+    "channel10": ch10_perc,
+    "channel11": ch11_kick,
+    "channel12": ch12_snare,
+    "channel13": ch13_rim,
+    "channel14": ch14_perc2,
+    "channel15": ch15_hihat,
+    "channel16": ch16_clap,
+}
+
+song = SongDefinition(
+    meta=meta,
+    samples=samples,
+    patterns=patterns,
+    tracks=tracks,
+    items=items,
+    melodic_tracks=melodic_tracks,
+)
+
+# ── build ─────────────────────────────────────────────────────────────────────
+print("\nValidating and building...")
+errors = song.validate()
+if errors:
+    print("VALIDATION ERRORS:")
+    for e in errors:
+        print(f"  - {e}")
+    sys.exit(1)
+
+builder = FLPBuilder()
+flp_bytes = builder.build(song)
+
+out_path = PROJECT / "output" / "reggaeton_full.flp"
+out_path.parent.mkdir(exist_ok=True)
+out_path.write_bytes(flp_bytes)
+
+size_kb = len(flp_bytes) / 1024
+print(f"\nOK {out_path}")
+print(f"  {size_kb:.1f} KB -- {BARS_TOTAL} bars @ {BPM} BPM = {SONG_DURATION_M[0]}:{SONG_DURATION_M[1]:02d}")
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