- Sub-tab selection loop only active when st.isLooping is true
- End-of-playback loop uses st.isLooping, not global isLoopingSelection
- SonicSF.stopAll() sets gain 0 and stops oscillators immediately
- Piano roll ruler click during playback now seeks and continues playing
- ADSR envelope uses linearRampToValueAtTime for crack-free release
- stopAll ramps gain to 0 in 20ms before stopping oscillators
3dtours