diff --git a/puredata_fr.md b/puredata_fr.md
index 28faf86..9c164e7 100644
--- a/puredata_fr.md
+++ b/puredata_fr.md
@@ -469,18 +469,29 @@ Par rapport aux simples connexions de signaux de données, sur lesquelles le son
 * Transformer ce délai en un effet "écho". Pour cela, il faut ajouter un *feedback*, c'est-à-dire que la ligne de délai doit additionner à elle-même le signal d'entrée avec délai. On obtient ainsi un "écho" qui dure assez longtemps (plusieurs réflections du son, de plus en plus faibles)
 
 ### Ressources
+* [Delay sur wikipedia (avec extraits audio)](https://fr.wikipedia.org/wiki/Delay_(effet))
 * [Patch du délai simple](./resources/11_delay.pd)
 * [Patch du délai écho](./resources/11_delay-feedback.pd)
 
-## Exemple 12 : effets audio avancés - phaser
+## Exemple 12 : effets audio avancés - flanger
 
-Un autre effet est le phaser. Le principe est assez proche du délai : on va ajouter au signal sonore une copie de lui-même, mais avec cette fois un délai très court. L'effet obtenu est facilement reconnaissable (essayer le patch ci-dessous).
+Un autre effet est le flanger. Le principe est assez proche du délai : on va ajouter au signal sonore une copie de lui-même, mais avec cette fois un délai très court. L'effet obtenu est assez facilement reconnaissable (essayer le patch ci-dessous).
+
+![flanger patch](./screenshots/12-flanger.png)
 
 ### À faire
-* Créer un phaser simple pour un de vos synthétiseurs
+* Re-créer et tester le patch ci-dessus
+* Créer un flanger simple pour un de vos synthétiseurs, en utilisant **delread4~** plutôt que delread~.
 
 ### Challenge
-* Introduire une légère modulation (variation au cours du temps) sur le délai du phaser
+* Introduire une légère modulation (variation au cours du temps) sur le délai du flanger
+
+### Ressources
+* [Flanger sur wikipedia (avec extraits audio)](https://fr.wikipedia.org/wiki/Flanger)
+* [Patch du flanger](./resources/12_flanger.pd)
+
+
+## Exemple 13 : musique contrôlée par la météo
 
 ## A short intermezzo
 
diff --git a/resources/12_flanger.pd b/resources/12_flanger.pd
new file mode 100644
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diff --git a/resources/12_phaser.pd b/resources/12_phaser.pd
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