diff --git a/packages/core/controls.mjs b/packages/core/controls.mjs
index d5dbef13..7e9556d3 100644
--- a/packages/core/controls.mjs
+++ b/packages/core/controls.mjs
@@ -753,6 +753,15 @@ export const { bprelease, bpr } = registerControl('bprelease', 'bpr');
  * .ftype("12db 24db")
  */
 export const { ftype } = registerControl('ftype');
+
+/**
+ * controls the center of the filter envelope. 0 is unipolar positive, .5 is bipolar, 1 is unipolar negative
+ * @name fanchor
+ * @param {number | Pattern} center 0 to 1
+ * @example
+ * note("{f g g c d a a#}%8").s("sawtooth").lpf("{1000}%2")
+ * .lpenv(8).fanchor("<0 .5 1>")
+ */
 export const { fanchor } = registerControl('fanchor');
 /**
  * Applies the cutoff frequency of the **h**igh-**p**ass **f**ilter.
diff --git a/packages/superdough/superdough.mjs b/packages/superdough/superdough.mjs
index 2b04dc1a..c37ff50b 100644
--- a/packages/superdough/superdough.mjs
+++ b/packages/superdough/superdough.mjs
@@ -24,6 +24,12 @@ export function getSound(s) {
   return soundMap.get()[s];
 }
 
+const defaults = new Map([['fanchor', 0]]);
+
+export function setDefault(key, value) {
+  defaults.set(key, value);
+}
+
 export const resetLoadedSounds = () => soundMap.set({});
 
 let audioContext;
@@ -289,7 +295,7 @@ export const superdough = async (value, t, hapDuration) => {
     density = 0.03,
     // filters
     ftype = '12db',
-    fanchor = 0,
+    fanchor = defaults.get('fanchor'),
     // low pass
     cutoff,
     lpenv,
diff --git a/test/__snapshots__/examples.test.mjs.snap b/test/__snapshots__/examples.test.mjs.snap
index 30db05a2..d1539ba4 100644
--- a/test/__snapshots__/examples.test.mjs.snap
+++ b/test/__snapshots__/examples.test.mjs.snap
@@ -2493,6 +2493,43 @@ exports[`runs examples > example "every" example index 0 1`] = `
 ]
 `;
 
+exports[`runs examples > example "fanchor" example index 0 1`] = `
+[
+  "[ 0/1 → 1/8 | note:f s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 1/8 → 1/4 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 1/4 → 3/8 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 3/8 → 1/2 | note:c s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 1/2 → 5/8 | note:d s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 5/8 → 3/4 | note:a s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 3/4 → 7/8 | note:a# s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 7/8 → 1/1 | note:f s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 1/1 → 9/8 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 9/8 → 5/4 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 5/4 → 11/8 | note:c s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 11/8 → 3/2 | note:d s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 3/2 → 13/8 | note:a s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 13/8 → 7/4 | note:a# s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 7/4 → 15/8 | note:f s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 15/8 → 2/1 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0.5 ]",
+  "[ 2/1 → 17/8 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 17/8 → 9/4 | note:c s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 9/4 → 19/8 | note:d s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 19/8 → 5/2 | note:a s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 5/2 → 21/8 | note:a# s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 21/8 → 11/4 | note:f s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 11/4 → 23/8 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 23/8 → 3/1 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:1 ]",
+  "[ 3/1 → 25/8 | note:c s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 25/8 → 13/4 | note:d s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 13/4 → 27/8 | note:a s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 27/8 → 7/2 | note:a# s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 7/2 → 29/8 | note:f s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 29/8 → 15/4 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 15/4 → 31/8 | note:g s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+  "[ 31/8 → 4/1 | note:c s:sawtooth cutoff:1000 lpenv:8 fanchor:0 ]",
+]
+`;
+
 exports[`runs examples > example "fast" example index 0 1`] = `
 [
   "[ 0/1 → 1/8 | s:bd ]",
@@ -5035,72 +5072,6 @@ exports[`runs examples > example "ply" example index 0 1`] = `
 ]
 `;
 
-exports[`runs examples > example "polymeter" example index 0 1`] = `
-[
-  "[ 0/1 → 1/3 | c ]",
-  "[ 0/1 → 1/3 | c2 ]",
-  "[ 1/3 → 2/3 | eb ]",
-  "[ 1/3 → 2/3 | g2 ]",
-  "[ 2/3 → 1/1 | g ]",
-  "[ 2/3 → 1/1 | c2 ]",
-  "[ 1/1 → 4/3 | c ]",
-  "[ 1/1 → 4/3 | g2 ]",
-  "[ 4/3 → 5/3 | eb ]",
-  "[ 4/3 → 5/3 | c2 ]",
-  "[ 5/3 → 2/1 | g ]",
-  "[ 5/3 → 2/1 | g2 ]",
-  "[ 2/1 → 7/3 | c ]",
-  "[ 2/1 → 7/3 | c2 ]",
-  "[ 7/3 → 8/3 | eb ]",
-  "[ 7/3 → 8/3 | g2 ]",
-  "[ 8/3 → 3/1 | g ]",
-  "[ 8/3 → 3/1 | c2 ]",
-  "[ 3/1 → 10/3 | c ]",
-  "[ 3/1 → 10/3 | g2 ]",
-  "[ 10/3 → 11/3 | eb ]",
-  "[ 10/3 → 11/3 | c2 ]",
-  "[ 11/3 → 4/1 | g ]",
-  "[ 11/3 → 4/1 | g2 ]",
-]
-`;
-
-exports[`runs examples > example "polymeterSteps" example index 0 1`] = `
-[
-  "[ 0/1 → 1/4 | c ]",
-  "[ 0/1 → 1/4 | e ]",
-  "[ 1/4 → 1/2 | d ]",
-  "[ 1/4 → 1/2 | f ]",
-  "[ 1/2 → 3/4 | c ]",
-  "[ 1/2 → 3/4 | g ]",
-  "[ 3/4 → 1/1 | d ]",
-  "[ 3/4 → 1/1 | e ]",
-  "[ 1/1 → 5/4 | c ]",
-  "[ 1/1 → 5/4 | f ]",
-  "[ 5/4 → 3/2 | d ]",
-  "[ 5/4 → 3/2 | g ]",
-  "[ 3/2 → 7/4 | c ]",
-  "[ 3/2 → 7/4 | e ]",
-  "[ 7/4 → 2/1 | d ]",
-  "[ 7/4 → 2/1 | f ]",
-  "[ 2/1 → 9/4 | c ]",
-  "[ 2/1 → 9/4 | g ]",
-  "[ 9/4 → 5/2 | d ]",
-  "[ 9/4 → 5/2 | e ]",
-  "[ 5/2 → 11/4 | c ]",
-  "[ 5/2 → 11/4 | f ]",
-  "[ 11/4 → 3/1 | d ]",
-  "[ 11/4 → 3/1 | g ]",
-  "[ 3/1 → 13/4 | c ]",
-  "[ 3/1 → 13/4 | e ]",
-  "[ 13/4 → 7/2 | d ]",
-  "[ 13/4 → 7/2 | f ]",
-  "[ 7/2 → 15/4 | c ]",
-  "[ 7/2 → 15/4 | g ]",
-  "[ 15/4 → 4/1 | d ]",
-  "[ 15/4 → 4/1 | e ]",
-]
-`;
-
 exports[`runs examples > example "postgain" example index 0 1`] = `
 [
   "[ 0/1 → 1/8 | s:hh compressor:-20 compressorRatio:20 compressorKnee:10 compressorAttack:0.002 compressorRelease:0.02 postgain:1.5 ]",
@@ -7216,31 +7187,6 @@ exports[`runs examples > example "stack" example index 0 2`] = `
 ]
 `;
 
-exports[`runs examples > example "stepcat" example index 0 1`] = `
-[
-  "[ 0/1 → 1/5 | s:bd ]",
-  "[ 1/5 → 2/5 | s:cp ]",
-  "[ 2/5 → 3/5 | s:bd ]",
-  "[ 3/5 → 4/5 | s:mt ]",
-  "[ 4/5 → 1/1 | s:bd ]",
-  "[ 1/1 → 6/5 | s:bd ]",
-  "[ 6/5 → 7/5 | s:cp ]",
-  "[ 7/5 → 8/5 | s:bd ]",
-  "[ 8/5 → 9/5 | s:mt ]",
-  "[ 9/5 → 2/1 | s:bd ]",
-  "[ 2/1 → 11/5 | s:bd ]",
-  "[ 11/5 → 12/5 | s:cp ]",
-  "[ 12/5 → 13/5 | s:bd ]",
-  "[ 13/5 → 14/5 | s:mt ]",
-  "[ 14/5 → 3/1 | s:bd ]",
-  "[ 3/1 → 16/5 | s:bd ]",
-  "[ 16/5 → 17/5 | s:cp ]",
-  "[ 17/5 → 18/5 | s:bd ]",
-  "[ 18/5 → 19/5 | s:mt ]",
-  "[ 19/5 → 4/1 | s:bd ]",
-]
-`;
-
 exports[`runs examples > example "steps" example index 0 1`] = `
 [
   "[ 0/1 → 1/4 | s:bd ]",
@@ -7554,65 +7500,6 @@ exports[`runs examples > example "swingBy" example index 0 1`] = `
 ]
 `;
 
-exports[`runs examples > example "timecat" example index 0 1`] = `
-[
-  "[ 0/1 → 3/4 | note:e3 ]",
-  "[ 3/4 → 1/1 | note:g3 ]",
-  "[ 1/1 → 7/4 | note:e3 ]",
-  "[ 7/4 → 2/1 | note:g3 ]",
-  "[ 2/1 → 11/4 | note:e3 ]",
-  "[ 11/4 → 3/1 | note:g3 ]",
-  "[ 3/1 → 15/4 | note:e3 ]",
-  "[ 15/4 → 4/1 | note:g3 ]",
-]
-`;
-
-exports[`runs examples > example "timecat" example index 1 1`] = `
-[
-  "[ 0/1 → 1/5 | s:bd ]",
-  "[ 1/5 → 2/5 | s:sd ]",
-  "[ 2/5 → 3/5 | s:cp ]",
-  "[ 3/5 → 4/5 | s:hh ]",
-  "[ 4/5 → 1/1 | s:hh ]",
-  "[ 1/1 → 6/5 | s:bd ]",
-  "[ 6/5 → 7/5 | s:sd ]",
-  "[ 7/5 → 8/5 | s:cp ]",
-  "[ 8/5 → 9/5 | s:hh ]",
-  "[ 9/5 → 2/1 | s:hh ]",
-  "[ 2/1 → 11/5 | s:bd ]",
-  "[ 11/5 → 12/5 | s:sd ]",
-  "[ 12/5 → 13/5 | s:cp ]",
-  "[ 13/5 → 14/5 | s:hh ]",
-  "[ 14/5 → 3/1 | s:hh ]",
-  "[ 3/1 → 16/5 | s:bd ]",
-  "[ 16/5 → 17/5 | s:sd ]",
-  "[ 17/5 → 18/5 | s:cp ]",
-  "[ 18/5 → 19/5 | s:hh ]",
-  "[ 19/5 → 4/1 | s:hh ]",
-]
-`;
-
-exports[`runs examples > example "toTactus" example index 0 1`] = `
-[
-  "[ 0/1 → 1/4 | s:bd ]",
-  "[ 1/4 → 1/2 | s:sd ]",
-  "[ 1/2 → 3/4 | s:cp ]",
-  "[ 3/4 → 1/1 | s:bd ]",
-  "[ 1/1 → 5/4 | s:sd ]",
-  "[ 5/4 → 3/2 | s:cp ]",
-  "[ 3/2 → 7/4 | s:bd ]",
-  "[ 7/4 → 2/1 | s:sd ]",
-  "[ 2/1 → 9/4 | s:cp ]",
-  "[ 9/4 → 5/2 | s:bd ]",
-  "[ 5/2 → 11/4 | s:sd ]",
-  "[ 11/4 → 3/1 | s:cp ]",
-  "[ 3/1 → 13/4 | s:bd ]",
-  "[ 13/4 → 7/2 | s:sd ]",
-  "[ 7/2 → 15/4 | s:cp ]",
-  "[ 15/4 → 4/1 | s:bd ]",
-]
-`;
-
 exports[`runs examples > example "transpose" example index 0 1`] = `
 [
   "[ 0/1 → 1/4 | note:C2 ]",