diff --git a/2Voices/ttl/2Voices.ttl b/2Voices/ttl/2Voices.ttl
index 30e06b5..98082f5 100644
--- a/2Voices/ttl/2Voices.ttl
+++ b/2Voices/ttl/2Voices.ttl
@@ -11,7 +11,10 @@
 <http://moddevices.com/plugins/mod-devel/2Voices>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "2Voices";
 
diff --git a/Capo/ttl/Capo.ttl b/Capo/ttl/Capo.ttl
index 8f580f5..d0ba152 100644
--- a/Capo/ttl/Capo.ttl
+++ b/Capo/ttl/Capo.ttl
@@ -12,7 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/Capo>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "Capo";
 
diff --git a/Drop/ttl/Drop.ttl b/Drop/ttl/Drop.ttl
index 2bd1f46..7b8cb68 100644
--- a/Drop/ttl/Drop.ttl
+++ b/Drop/ttl/Drop.ttl
@@ -12,7 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/Drop>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "Drop";
 
diff --git a/Harmonizer/ttl/Harmonizer.ttl b/Harmonizer/ttl/Harmonizer.ttl
index da38415..b6e6198 100644
--- a/Harmonizer/ttl/Harmonizer.ttl
+++ b/Harmonizer/ttl/Harmonizer.ttl
@@ -12,7 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/Harmonizer>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "Harmonizer";
 
diff --git a/Harmonizer2/ttl/Harmonizer2.ttl b/Harmonizer2/ttl/Harmonizer2.ttl
index 9fb920e..6dbe32d 100644
--- a/Harmonizer2/ttl/Harmonizer2.ttl
+++ b/Harmonizer2/ttl/Harmonizer2.ttl
@@ -12,8 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/Harmonizer2>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
-
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 doap:name "Harmonizer2";
 
 doap:developer [
diff --git a/HarmonizerCS/ttl/HarmonizerCS.ttl b/HarmonizerCS/ttl/HarmonizerCS.ttl
index 85b836b..b8a8851 100644
--- a/HarmonizerCS/ttl/HarmonizerCS.ttl
+++ b/HarmonizerCS/ttl/HarmonizerCS.ttl
@@ -12,7 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/HarmonizerCS>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "HarmonizerCS";
 
diff --git a/SuperCapo/ttl/SuperCapo.ttl b/SuperCapo/ttl/SuperCapo.ttl
index 75dd704..e0405fc 100644
--- a/SuperCapo/ttl/SuperCapo.ttl
+++ b/SuperCapo/ttl/SuperCapo.ttl
@@ -12,7 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/SuperCapo>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "Super Capo";
 
diff --git a/SuperWhammy/ttl/SuperWhammy.ttl b/SuperWhammy/ttl/SuperWhammy.ttl
index 2dcfc7f..c11ec69 100644
--- a/SuperWhammy/ttl/SuperWhammy.ttl
+++ b/SuperWhammy/ttl/SuperWhammy.ttl
@@ -12,7 +12,10 @@
 <http://moddevices.com/plugins/mod-devel/SuperWhammy>
 a lv2:Plugin, lv2:SpectralPlugin;
 
-lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength;
+lv2:requiredFeature bsize:fixedBlockLength, bsize:powerOf2BlockLength,
+       bsize:boundedBlockLength ;
+bsize:minBlockLength 64 ;
+bsize:maxBlockLength 8192 ;
 
 doap:name "Super Whammy";