fix sample rate mismatch

xybrid/audio/audioengine.cpp

@@ -143,6 +143,9 @@ void AudioEngine::play(std::shared_ptr<Project> p, int fromPos) {
         if (!p) return; // nope
         project = p;
 
+        if (output) output->stop();
+        output.reset();
+
         // load audio settings
         sampleRate = AudioConfig::playbackSampleRate;
         bufferMs = AudioConfig::playbackBufferMs;