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KOACH · FUNs · Level 5 · Hidden LFOs · Lesson 6 of 14

ramp(f=a*10^b)

ramps= a sawtooth at 25 × a × 100^(b − 1) Hz

A sawtooth LFO whose rate b sweeps over two decades on a log scale and a scales. A positive rate gives a saw rising from -1 to +1, a negative one a falling saw.

SEE IT MOVE

SCOPE · LAST 2 S
THE WAVE · LAST 8 S
a0.00
b0.00
OUTPUT0.00

Computed in your browser with KINSPIRATION's FUN engine, step by step: this FUN keeps a state, so its output depends on what came before.

WHAT TO KNOW

INPUTS

a: the top rate's share (ON = 25 Hz at b = +1); b: the rate control on a log scale.

OUTPUT RANGE

-1..+1, a sawtooth

USE IT FOR

Rates from slow to fast on one control, with fine resolution at the slow end.

WATCH OUT

With a = ON, b = 0 gives 0.25 Hz and b = +1 gives 25 Hz: the slow rates take most of the travel, the fast ones come at the top.

IN THE FACTORY PROGRAMS

No factory program uses it: one of the K2700's hidden tools.

HOW TO ON YOUR K2700 · 2046 Editor Template

The factory does not route ramp(f=a*10^b) to a sound on its own: set one up on 2046 Editor Template and hear it on the pitch.

  1. In Program mode choose 2046 Editor Template, a plain one-layer program to build on (KEYPAD, 2046, ENTER).

    Program mode with 2046 Editor Template

  2. Press EDIT, then MORE and DSP MOD. On the Pitch row set Source 1 to FUN2 and its Depth to 1200 ct: FUN2's result, −1 to +1, now bends the pitch up to an octave either way.

    The DSP MOD page of 2046 Editor Template, layer 1, the cursor on Depth (1200 ct)

  3. MORE, then LFO+. On the FUN2 row set Input a to ON and Input b to MWheel.

    The LFO+ page of 2046 Editor Template, layer 1, the cursor on Input b (MWheel)

  4. Move to Function and turn the Alpha Wheel to ramp(f=a*10^b).

    The LFO+ page of 2046 Editor Template, layer 1, the cursor on Function (ramp(f=a*10^b))

  5. Hold a note and push the mod wheel up: the saw goes from one cycle in 4 s (0.25 Hz) to a 25 Hz buzz, on a log scale: each tenth of the wheel multiplies the rate by about 1.6.

  6. Press EXIT and answer NO to leave the factory program as it was, or SAVE to keep your version on a USER ID.