FOF Choir – Matrix

FOF Choir – Matrix


Inspired by Stockhausen’s Stimmung (for 6 vocalist), I generated ostinato vowel patterns, using Csound (see FOF Choir instrument) of 4 out of the 5 vowels a, e, i, o, u, (triplets 3) in 8 different rhythms ranging from 4 whole notes to 4 sixteenth notes. I used the Matrix (see also my Sansula Matrix instrument), to cluster these different rhythms in 3 notes.
These rhythms adapt to the tempo of your DAW. Every note has a different ostinato vowel pattern, one of the 120 possible permutations.
You can individually assign the different rhythms to each cluster of 3 notes, or use the randomize button (or red keyswitch) to get a random assignment. With the column select buttons (or yellow keyswitches) you can also assign the complete range to a rhythm.
The instrument is available in Kontakt 6 and in DecentSampler format (split into 9 instruments: random rhythm pattern, 8 rhythm patterns (4 whole notes – 4 sixteenth notes) as 60bpm loops)
Developed in CSound 6.15, Kontakt 6, DecentSampler
Simple demo to get an impression:


Leave a review to let others know what you thought of the instrument!


5.0 rating
June 19, 2021

I tried to do something similar using arpeggiators with the FOF choir instrument but didn’t get the sound that was in my head, and this is exactly what I was looking for. It’s amazing, thank you!

Ivan Barreto

wonderful idea and sound

5.0 rating
June 19, 2021

Great idea here, and the sound is beautiful, very inspiring.


Very promising

5.0 rating
June 14, 2021

Has a great GUI and the idea is top notch.
You can shuffle between different note length ostinatos and also a randomiser is there. Instant Philip Glass I would say.
Thanks a lot for making this!



Ostinato vowel patterns available in 120 possible permutations

5.0 rating
5 out of 5 stars (based on 3 reviews)
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