Function pingPongPercent

Continually loops up and down between 0 and 1 by a specified interval. Looping returns start value, and is inclusive of 0 and 1.

Example: Usage

import {percentPingPong} from 'https://unpkg.com/ixfx/dist/modulation.js';
for (const v of percentPingPong(0.1)) {
 // v will go up and down. Make sure you have a break somewhere because it is infinite
}
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Example: Alternative:

const pp = pingPongPercent(0.1, 0.5); // Setup generator one time
const v = pp.next().value; // Call .next().value whenever a new value is needed
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Because limits are capped to -1 to 1, using large intervals can produce uneven distribution. Eg an interval of 0.8 yields 0, 0.8, 1

upper and lower define the percentage range. Eg to ping pong between 40-60%:

const pp = pingPongPercent(0.1, 0.4, 0.6);
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