velocity-curve

velocity-curve reshapes note-on velocities through a gamma curve.

It is the touch control miditool’s random effects often need: a scrambled or scattered keyboard invites harder playing than usual, and a gentle curve keeps the result musical. Gamma below 1 lifts soft playing (quiet notes speak more easily); gamma above 1 tames it (the instrument demands more deliberate weight).

The mapping is floor + (ceiling - floor) * (v/127)^gamma, rounded and clamped into 1..=127. floor and ceiling are not a clamp: they rescale the whole curve, so the full sweep of your touch spreads across floor..=ceiling, and setting them equal flattens dynamics entirely. Only note-on velocities are touched; note-offs and controllers pass through.

Parameters

Parameter	Type	Default	Range
gamma	number	1.0	finite, greater than 0
floor	velocity	1	1..=127, at most ceiling
ceiling	velocity	127	1..=127

Example

miditool.kdl

input "Roland"
output virtual="miditool Out"

velocity-curve floor=88 ceiling=88      // every note at 88, however struck

A harpsichord’s indifference: the key speaks at one level no matter how it is hit, and all the expression left is timing.

Try this

Terrace the dynamics instead: two fixed levels, chosen by how hard you play.

fork {
    chain {
        velocity-range lo=1 hi=79
        velocity-curve gamma=1.0 floor=60 ceiling=60
    }
    chain {
        velocity-range lo=80 hi=127
        velocity-curve gamma=1.0 floor=100 ceiling=100
    }
}

Then loosen it again: velocity-curve gamma=0.8 alone lifts the soft end a little and leaves the rest of your touch as it was.