Eurorack modules like euclidean, this is a php gist to generate euclidean steps / truth tables

euclideanGeneration.php

<?php

// this will probably be arduino code at one point
// but it's still trash atm

function gcd2($k, $n, $steps) {
    if($n<2) return $steps;
    else {
        // $steps
        $cnt = count($steps);
        if ($cnt < 2*$n) return $steps;

        $f = (int)(($k-$n)/$n);
        if ($f == 0) $f = 1;

        for ($i=0; $i<$n; $i++)
        {
            for ($j=1; $j<=$f; $j++) {
                $steps[$i] = array_merge($steps[$i], $steps[$cnt-($j*$n)+$i]);
                unset($steps[$cnt-($j*$n)+$i]);
            }
        }

//                    pp($f ." " . $k ." " . $n ." " . $k%$n);
//                     pp($steps);

        return gcd2($n, $k%$n, $steps);
    }
}

function printFlat($a) {
    foreach ($a as $k=>$i) {
        if ($i) echo 'x ';
        else echo '. ';
    }
    echo "<br>";
}

function euclidean($k, $n){

    $steps = array(array());
    for ($i=0; $i<$k; $i++) {
        if ($i<$n) $steps[$i][] = true;
        else $steps[$i][] = false;
    }

    $steps = gcd2($k, $n, $steps);
    $combined = array();
    for ($i=0; $i<count($steps); $i++) {
        $combined = array_merge($combined, $steps[$i]);
    }

    echo "$k|$n ";
    printFlat($combined);
}

echo '<pre>';
for($i=3; $i<16; $i++) {
    for($j=1; $j<=$i/2; $j++) {
        euclidean($i, $j);
    }
}
//            euclidean(10, 2);
echo '</pre>';