diff --git a/pd/synth.pd b/pd/synth.pd
index 98f78a8..6eb662f 100644
--- a/pd/synth.pd
+++ b/pd/synth.pd
@@ -27,9 +27,11 @@
 #X obj 180 460 *~;
 #X obj 320 460 *~;
 #X obj 250 530 dac~;
-#X obj 350 330 hsl 128 15 100 18000 10000 0 0 0 empty Cutoff -2 -8 0 10 -262144 -1 -1 7200 1;
-#X obj 350 430 hsl 128 15 0 100 40 0 0 0 empty Volume -2 -8 0 10 -262144 -1 -1 7200 1;
-#X obj 350 460 / 100;
+#X obj 350 300 loadbang;
+#X obj 350 320 float 10000;
+#X obj 350 400 loadbang;
+#X obj 350 420 float 80;
+#X obj 350 450 / 100;
 #X connect 0 0 1 0;
 #X connect 0 1 1 1;
 #X connect 1 0 2 0;
@@ -58,8 +60,10 @@
 #X connect 14 0 16 0;
 #X connect 16 0 24 1;
 #X connect 24 0 25 0;
-#X connect 27 0 23 1;
-#X connect 28 0 29 0;
-#X connect 29 0 25 1;
+#X connect 27 0 28 0;
+#X connect 28 0 23 1;
+#X connect 29 0 30 0;
+#X connect 30 0 31 0;
+#X connect 31 0 25 1;
 #X connect 25 0 26 0;
 #X connect 25 0 26 1;
diff --git a/scripts/gen_synth_pd.py b/scripts/gen_synth_pd.py
index d3170af..9d9577e 100644
--- a/scripts/gen_synth_pd.py
+++ b/scripts/gen_synth_pd.py
@@ -82,12 +82,17 @@ def gen():
     connect(c, env, 0, amp, 1)
     connect(c, amp, 0, panscale, 0)
 
-    # ── Controls ──
-    cutoff = Obj(350, 330, "hsl 128 15 100 18000 10000 0 0 0 empty Cutoff -2 -8 0 10 -262144 -1 -1 7200 1")
-    volume = Obj(350, 430, "hsl 128 15 0 100 40 0 0 0 empty Volume -2 -8 0 10 -262144 -1 -1 7200 1")
-    div = Obj(350, 460, "/ 100")
-    connect(c, cutoff, 0, filt, 1)
-    connect(c, volume, 0, div, 0)
+    # ── Controls (headless-safe: loadbang-initialized floats, not hsl) ──
+    lb_cut = Obj(350, 300, "loadbang")
+    float_cut = Obj(350, 320, "float 10000")
+    connect(c, lb_cut, 0, float_cut, 0)
+    connect(c, float_cut, 0, filt, 1)
+
+    lb_vol = Obj(350, 400, "loadbang")
+    float_vol = Obj(350, 420, "float 80")
+    div = Obj(350, 450, "/ 100")
+    connect(c, lb_vol, 0, float_vol, 0)
+    connect(c, float_vol, 0, div, 0)
     connect(c, div, 0, panscale, 1)
 
     # ── Output ──