tracker-music-fundamentals

name	Tracker Music Fundamentals
description	Use this skill when generating tracker music to understand WHY to use specific techniques. This is the philosophy layer that separates amateur from polished output. **Pipeline position: COMPOSITION (3 of 3)** - For music theory (modes, progressions): use `sound-design:music-composition` - For instrument synthesis: use `zx-procgen:procedural-instruments` **Trigger phrases:** "why use vibrato", "when to use effects", "make it sound professional", "tracker polish", "humanize the music", "sound less mechanical" **Load references when:** - Effect combinations/mood mapping → `references/effect-philosophy.md` - Sample budget/reuse strategies → `references/sample-economy.md` - Channel layout patterns → `references/channel-allocation.md` - Quality checklist → `references/quality-checklist.md` For format-specific implementation, use `xm-format` or `it-format` skills.
version	1.2.0

Tracker Music Fundamentals

Core Philosophy

Tracker music is constraint-driven art. Limited channels, limited polyphony, limited effects - but these constraints create a distinctive aesthetic. The goal isn't to simulate an orchestra; it's to create music that sounds intentional within tracker limitations.

Three Pillars:

1. Economy - Maximum musical impact with minimum resources
2. Expression - Effects as musical expression, not decoration
3. Flow - Seamless playback with intentional dynamics

Amateur vs Polished

Amateur	Polished
Flat velocity throughout	Velocity variation on repeating notes
Effects used randomly	Effects serve musical purpose
Copy-paste patterns	Pattern variations with small changes
Abrupt note endings	Volume fades and release tails
Mechanical timing	Slight groove variations

Effect Quick Reference

Effects aren't decoration - they're musical expression encoded as data.

Effect	When to Use	When NOT to Use
Vibrato (H/4)	Sustained leads 8+ rows	Drums, bass, short notes
Portamento (G/3)	Melodic transitions, emphasis	Drums, staccato
Arpeggio (J/0)	Chords on limited channels	When spare channels exist
Volume Slide (D/A)	Fades, swells, dynamics	Steady bass lines
Pitch Slide (E-F/1-2)	Kick punch, synth attacks	Acoustic instruments
Retrigger (Q/E9x)	Snare rolls, builds	Sustained passages

Effect Application Patterns

# Vibrato for warmth (delay entry for natural feel)
row 0:  C-4 01 -- ---   # Clean attack
row 4:  --- -- -- H24   # Vibrato enters (speed 2, depth 4)

# Portamento for emphasis (slide INTO important notes)
row 0:  C-4 01 40 ---   # Setup note
row 8:  E-4 01 40 G10   # Slide UP to target

# Punchy kick with pitch drop
row 0:  C-5 01 40 E40   # Start high, slide down fast

Human Feel Techniques

Velocity Variation

Never use the same velocity for repeating notes:

# Pattern for natural feel
velocities = [48, 40, 44, 36, 48, 38, 46, 40]
for i, row in enumerate(range(0, 64, 4)):
    vol = velocities[i % len(velocities)]
    pattern.set_note(row, ch, ItNote.play("C-4", inst, vol))

Ghost Notes

Quiet notes between main hits add life:

for row in range(0, 64, 2):
    if row % 4 == 0:
        pattern.set_note(row, ch, note.with_volume(48))  # Main
    else:
        pattern.set_note(row, ch, note.with_volume(24))  # Ghost

Groove/Swing

Use note delay (SDx) for swing feel:

for row in range(0, 64, 4):
    if (row // 4) % 2 == 1:
        note = note.with_effect(19, 0xD2)  # SD2: delay odd hits
    pattern.set_note(row, ch, note)

Pattern Variation Principles

The 4-Bar Rule

Never loop the same 4 bars more than twice without variation.

Variation techniques:

1. Add/remove a note - Same pattern, one element different
2. Velocity change - Same notes, different emphasis
3. Fill on 4th bar - Drum fill every 4th repetition
4. Effect variation - Add vibrato/slide on repeat
5. Octave shift - Same melody, different register

Typical 8-Channel Layout

Ch	Role	Character
1	Kick	Low, punchy
2	Snare	Mid, snappy
3	Hi-hat	High, short
4	Bass	Low synth
5-6	Leads	Main melody
7	Pad/Chord	Harmony
8	FX	Risers, impacts

Reference Files

• references/effect-philosophy.md - Deep dive on effect combinations, mood mapping
• references/sample-economy.md - Loop points, sample sharing, size optimization
• references/channel-allocation.md - Detailed channel strategies by genre
• references/quality-checklist.md - Pre-release validation checklist