@moriez
Have you tried using the original WinUAE A1200 setup, and ran it that way just to rule out the Amigaforever package.
I have no problems whatsoever under WinUAE alone (A1200 setup), runs like a dream, best way to convert to MP3 too (in real time)
@TCD
But maybe you have a point there, Renoise is a cool editor too