Strumboli

Turn your drawing tablet into a MIDI strumming controller

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Control how long notes play based on tablet input

Note Duration

Controls how long notes play based on tablet input. This is crucial for creating different articulations from staccato to sustained.

Settings

control

Type: string
Default: "yaxis"
Options: "pressure", "tiltX", "tiltY", "tiltXY", "xaxis", "yaxis"
Description: Which tablet input controls note duration

Examples:

{
  "noteDuration": {
    "control": "yaxis"
  }
}

Common mappings:

  • "yaxis" - Vertical position (higher = longer/shorter depending on spread)
  • "tiltXY" - Combined tilt (more tilt = longer/shorter)
  • "pressure" - Harder press = longer/shorter

min

Type: float
Default: 0.15
Range: > 0
Units: Seconds
Description: Minimum note duration

Examples:

{
  "noteDuration": {
    "min": 0.1
  }
}

Very short values (< 0.1) create staccato effects.

max

Type: float
Default: 1.5
Range: > min
Units: Seconds
Description: Maximum note duration

Examples:

{
  "noteDuration": {
    "max": 3.0
  }
}

Higher values allow sustained notes and pads.

default

Type: float
Default: 1.0
Range: Between min and max
Units: Seconds
Description: Default duration when control is neutral (for "central" spread)

Examples:

{
  "noteDuration": {
    "default": 0.5
  }
}

curve

Type: float
Default: 1.0
Range: > 0
Description: Response curve shape

Values:

  • 1.0 - Linear (no curve)
  • 2.0 - Gentle curve
  • 3.0 - Moderate curve
  • 4.0 - Steep curve (very sensitive at low end)
  • 0.5 - Compressed (reduces low-end sensitivity)

Examples:

{
  "noteDuration": {
    "curve": 2.0
  }
}

spread

Type: string
Default: "inverse"
Options: "direct", "inverse", "central"
Description: How input maps to output range

Values:

  • "direct" - 0 → min, 1 → max
  • "inverse" - 0 → max, 1 → min
  • "central" - 0.5 → default, edges → min/max

Examples:

{
  "noteDuration": {
    "spread": "inverse"
  }
}

For duration, "inverse" means light touch = longer notes.

multiplier

Type: float
Default: 1.0
Range: > 0
Description: Overall scale factor applied to final value

Examples:

{
  "noteDuration": {
    "multiplier": 1.5
  }
}

Multiplies the final duration after all other calculations.

Configuration Example

{
  "noteDuration": {
    "min": 0.15,
    "max": 1.5,
    "default": 1.0,
    "multiplier": 1.0,
    "curve": 1.0,
    "spread": "inverse",
    "control": "yaxis"
  }
}

Usage Examples

Staccato (Short Notes)

{
  "noteDuration": {
    "min": 0.05,
    "max": 0.3,
    "control": "yaxis"
  }
}

Sustained (Long Notes)

{
  "noteDuration": {
    "min": 2.0,
    "max": 8.0,
    "control": "yaxis"
  }
}

Varied Expression

{
  "noteDuration": {
    "min": 0.1,
    "max": 3.0,
    "curve": 2.0,
    "control": "pressure"
  }
}

Related Documentation