add superdough package

packages/superdough/reverb.mjs

@@ -0,0 +1,23 @@
+if (typeof AudioContext !== 'undefined') {
+  AudioContext.prototype.impulseResponse = function (duration, channels = 1) {
+    const length = this.sampleRate * duration;
+    const impulse = this.createBuffer(channels, length, this.sampleRate);
+    const IR = impulse.getChannelData(0);
+    for (let i = 0; i < length; i++) IR[i] = (2 * Math.random() - 1) * Math.pow(1 - i / length, duration);
+    return impulse;
+  };
+
+  AudioContext.prototype.createReverb = function (duration) {
+    const convolver = this.createConvolver();
+    convolver.setDuration = (d) => {
+      convolver.buffer = this.impulseResponse(d);
+      convolver.duration = duration;
+      return convolver;
+    };
+    convolver.setDuration(duration);
+    return convolver;
+  };
+}
+
+// TODO: make the reverb more exciting
+// check out https://blog.gskinner.com/archives/2019/02/reverb-web-audio-api.html