Parameters in mda Detune VST v1.0.0.1 (only version ever released as far as I know. Simple, old, yet useful little plugin.) doesn’t get saved with songs in Renoise. When a song is reloaded the parameters are reset to default. I’m using Windows XP.
dunno if it is v1.0.0.1, but on 29 08 09 there has been the last build, get it here:
http://sourceforge.net/projects/mda-vst/fi…29.zip/download
edit:
also don’t know if a newer build fixes your problem 
This one saves parameters fine, thanks