var toggle = L.easyButton({
states: [{
stateName: 'multi-modal',
icon: 'fa-random',
title: 'Multi-Modal: ON',
onClick: function(control) {
  control.state('single-modal');
}
}, {
stateName: 'single-modal',
icon: 'fa-arrow-right',

title: 'Multi-Modal: OFF',
onClick: function(control) {
  control.state('multi-modal');
},
}]
});
toggle.addTo(mymap);

var multi;
if (toggle.state == 'multi-modal'){
var multi = false;
} else{
var multi = true;
}