diff --git a/packages/core/controls.mjs b/packages/core/controls.mjs
index c5c19644..6e34c3d0 100644
--- a/packages/core/controls.mjs
+++ b/packages/core/controls.mjs
@@ -581,6 +581,11 @@ const generic_params = [
     'size',
     'a pattern of numbers from 0 to 1. Sets the perceptual size (reverb time) of the `room` to be used in reverb.',
   ],
+  [
+    'f',
+    'roomsize',
+    'a pattern of numbers from 0 to 1. Sets the perceptual size (reverb time) of the `room` to be used in reverb.',
+  ],
   // ['f', 'sagogo', ''],
   // ['f', 'sclap', ''],
   // ['f', 'sclaves', ''],
diff --git a/packages/webaudio/reverb.mjs b/packages/webaudio/reverb.mjs
index 4757932d..10e6dcd1 100644
--- a/packages/webaudio/reverb.mjs
+++ b/packages/webaudio/reverb.mjs
@@ -11,8 +11,9 @@ if (typeof AudioContext !== 'undefined') {
     const convolver = this.createConvolver();
     convolver.setDuration = (d) => {
       convolver.buffer = this.impulseResponse(d);
+      convolver.duration = duration;
+      return convolver;
     };
-    this.duration = duration;
     convolver.setDuration(duration);
     return convolver;
   };
diff --git a/packages/webaudio/webaudio.mjs b/packages/webaudio/webaudio.mjs
index 2e7de7be..41c6f748 100644
--- a/packages/webaudio/webaudio.mjs
+++ b/packages/webaudio/webaudio.mjs
@@ -217,7 +217,8 @@ function getReverb(orbit, duration = 2) {
     reverbs[orbit] = reverb;
   }
   if (reverbs[orbit].duration !== duration) {
-    reverbs[orbit].setDuration(duration);
+    reverbs[orbit] = reverbs[orbit].setDuration(duration);
+    reverbs[orbit].duration = duration;
   }
   return reverbs[orbit];
 }
@@ -277,6 +278,7 @@ export const webaudioOutput = async (hap, deadline, hapDuration) => {
       orbit = 1,
       room,
       size = 2,
+      roomsize = size,
     } = hap.value;
     const { velocity = 1 } = hap.context;
     gain *= velocity; // legacy fix for velocity
@@ -405,8 +407,8 @@ export const webaudioOutput = async (hap, deadline, hapDuration) => {
     }
     // reverb
     let reverbSend;
-    if (room > 0 && size > 0) {
-      const reverbNode = getReverb(orbit, size);
+    if (room > 0 && roomsize > 0) {
+      const reverbNode = getReverb(orbit, roomsize);
       reverbSend = effectSend(post, reverbNode, room);
     }