telescope

telescope scales every note’s distance from a reference key: intervals stretch or squeeze.

The mapping is out = reference + round((key - reference) * factor). Above 1 the keyboard pulls apart: at factor=2 a fifth up from the reference becomes a ninth, and a modest hand span covers four octaves. Below 1 it collapses inward: at factor=0.5 an octave shrinks to a tritone, wide arpeggios crowd into clusters, and neighboring keys start landing on the same note. The reference key always maps to itself.

The mapping is deterministic, no seed. A result outside the MIDI range drops the note, and its note-off with it; everything that sounds releases correctly.

Parameters

Parameter	Type	Default	Range
factor	number	required	0.1..=8.0
reference	key number	60 (C4)	0..=127

Example

miditool.kdl

input "Roland"
output virtual="miditool Out"

telescope factor=2.0          // every interval from middle C doubled

Try this

Play against your own stretched shadow:

fork {
    pass
    telescope factor=2.0
}

Every gesture sounds at true size and at double magnification simultaneously, agreeing only on middle C. Then invert the idea with factor=0.25: whatever you play, the shadow barely moves, a drone that leans the way you lean.