instrument: deliver continuous playback params live to sounding voices via a seqlock block, holding normalized stage position across time edits

src/shell/instrument/processor_state.cpp

@@ -152,6 +152,13 @@ void ReaSamplerProcessor::setInstrumentParams(const InstrumentParams& params) {
     params_ = params;
 }
 
+void ReaSamplerProcessor::publishLiveParams() {
+    const int rate = builtSampleRate_.load(std::memory_order_relaxed);
+    if (rate <= 0) return;
+    liveParams_.publish(
+        instrument::engine::foldLive(resolvePlay(instrumentParams().play, rate)));
+}
+
 SampleRefs ReaSamplerProcessor::sampleRefs() {
     std::lock_guard<std::mutex> lock(refsMutex_);
     return sampleRefs_;