Right so, I'm uploading another build now that addresses the hrange problem somewhat. You can find it at the same link as in my previous message. It should work fine now, but that there is still an issue. The initial values are being set, but not visually. So when you do range(0, 1000, 60:600), Csound is notified of the 60 and 600, but the slider thumbs are not showing in the correct position. It will take me some time to sort that as I can't see what the problem is.