diff --git a/slab/macos-audio/Sources/ACMacAudio/ProcessAudioTap.swift b/slab/macos-audio/Sources/ACMacAudio/ProcessAudioTap.swift
index 703f4a9792..0ecbbf3413 100644
--- a/slab/macos-audio/Sources/ACMacAudio/ProcessAudioTap.swift
+++ b/slab/macos-audio/Sources/ACMacAudio/ProcessAudioTap.swift
@@ -77,6 +77,24 @@ public final class ACProcessAudioTap: @unchecked Sendable {
             ]
             status = AudioHardwareCreateAggregateDevice(aggregateDescription as CFDictionary, &aggregateID)
             guard status == noErr else { throw ACAudioRoomError.coreAudio("Create tap aggregate", status) }
+            // The IOProc runs on the AGGREGATE's clock (its main subdevice is
+            // the current output device) and drift compensation delivers the
+            // tap's samples AT THAT RATE. On a 96 kHz interface, a tap that
+            // claims 48 kHz would otherwise have its buffers wrapped and
+            // paced as 48 kHz: audio at the wrong pitch and a presentation
+            // clock racing 2× real time, so receivers chase chunks scheduled
+            // for a future that never arrives. Trust the aggregate's rate.
+            if let aggregateRate = try? Self.read(aggregateID,
+                                                  selector: kAudioDevicePropertyNominalSampleRate,
+                                                  defaultValue: Double(0)),
+               aggregateRate > 0, abs(aggregateRate - format.sampleRate) > 1 {
+                var corrected = stream
+                corrected.mSampleRate = aggregateRate
+                if let correctedFormat = AVAudioFormat(streamDescription: &corrected) {
+                    self.format = correctedFormat
+                    onLog?("tap delivers at aggregate rate \(Int(aggregateRate)) Hz (tap claimed \(Int(format.sampleRate)))")
+                }
+            }
             self.handler = handler
             status = AudioDeviceCreateIOProcIDWithBlock(&ioProcID, aggregateID, queue) {
                 [weak self] _, inputData, _, _, _ in
diff --git a/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift b/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift
index bfd15bdf1b..e211bffadb 100644
--- a/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift
+++ b/slab/macos-audio/Sources/ACMacAudio/RoomSender.swift
@@ -173,6 +173,19 @@ public final class ACAudioRoomSender: @unchecked Sendable {
         }
         lastAudioNanos = now
 
+        // Insurance against pacing bugs (a wrong input rate, device quirks):
+        // if the presentation clock drifts more than a second from
+        // wall-clock + latency, resync with a fresh session rather than
+        // keep scheduling audio for a time that never comes.
+        let target = now + configuration.latencyMilliseconds * 1_000_000
+        let drift = Int64(bitPattern: nextPresentationNanos &- target)
+        if abs(drift) > 1_000_000_000 {
+            log(String(format: "presentation clock drifted %+.1f s — resyncing", Double(drift) / 1e9))
+            session = UInt32.random(in: 1...UInt32.max)
+            sequence = 0
+            nextPresentationNanos = target
+        }
+
         var offset = 0
         let total = Int(output.frameLength)
         while offset < total {