update release notes

README.md

@@ -36,7 +36,7 @@ Here's a snapshot of it: [veeseevstrack_0_6_1_win64_bin-09Sep2018.7z](https://gi
 
 Note: The effect plugin can used be as an instrument, too. You just have to send it MIDI events !
 
-Note: The idle detection is enabled by default. A side effect of this is that e.g. sequencer modules will not play while the plugin is idle. Please turn off the idle detection in the toolbar menu (set it to "Always Active") in this case.
+Note: The idle detection is enabled by default. A side effect of this is that e.g. sequencer modules will not play while the plugin is idle. Please turn off the idle detection in the toolbar menu (set it to "Always Active") in this case. Since some of the UI handling is tied to the engine, certain widgets (typically buttons, e.g. the waveform selector in the Macro Oscillator module) will not work while the plugin is idle. Play some notes (or turn off the idle detection) in this case.
 
 
 # Installation