public function findInstrumentsBySection(Api_Controller $controller)
 {
     $section = $controller->params['section'];
     if (!isset($section)) {
         $controller->setError(array("status" => 400, "dev" => "No section supplied", "user" => "No section supplied"));
         return;
     }
     foreach ($this->instruments as $instrument) {
         $sec = ',' . $section . ',';
         $insec = ',' . $instrument['section'] . ',';
         if (strpos(',' . strtolower($section) . ',', ',' . strtolower($instrument['section']) . ',') !== FALSE) {
             $controller->output[] = $instrument;
         }
     }
 }