Polyrhythms up to 8 beats by Wolfram Winkel
for iPhone, iPod touch and iPad
The app produces the most common rhythmic overlays (such as 5:3) using two different clicks accompanied by a display of the score.
About the Method
The books Five Over Three (English version) and Die Rhythmik der Neuen Musik (original German version) are available worldwide from Edition Katarakt.
If you wish to perform Invisible Drums by Wolfram Winkel, please feel free to contact me. I can send you score and audio free of charge.