diff --git a/crap/tube.h b/crap/tube.h
index aa37ed5..2d0e646 100644
--- a/crap/tube.h
+++ b/crap/tube.h
@@ -125,38 +125,7 @@ process_double(personal *data,
 	}
 }
 
-INNER void
-process(personal *data,
-    float *in_L, float *in_R,
-    float *out_L, float *out_R,
-    ulong count)
-{
-	double  in_L2[BLOCK_SIZE],  in_R2[BLOCK_SIZE];
-	double out_L2[BLOCK_SIZE], out_R2[BLOCK_SIZE];
-
-	for (ulong pos = 0; pos < count; pos += BLOCK_SIZE) {
-		ulong rem = BLOCK_SIZE;
-		if (pos + BLOCK_SIZE > count)
-			rem = count - pos;
-
-		for (ulong i = 0; i < rem; i++)
-			in_L2[i] = in_L[i];
-		for (ulong i = 0; i < rem; i++)
-			in_R2[i] = in_R[i];
-
-		process_double(data, in_L2, in_R2, out_L2, out_R2, rem);
-
-		for (ulong i = 0; i < rem; i++)
-			out_L[i] = out_L2[i];
-		for (ulong i = 0; i < rem; i++)
-			out_R[i] = out_R2[i];
-
-		in_L += BLOCK_SIZE;
-		in_R += BLOCK_SIZE;
-		out_L += BLOCK_SIZE;
-		out_R += BLOCK_SIZE;
-	}
-}
+#include "process.h"
 
 INNER void
 resume(personal *data)
diff --git a/include/process.h b/include/process.h
new file mode 100644
index 0000000..bbc2450
--- /dev/null
+++ b/include/process.h
@@ -0,0 +1,38 @@
+// provides a generic wrapper around process_double
+
+#ifndef BLOCK_SIZE
+#define BLOCK_SIZE 256
+#endif
+
+static void
+process(personal *data,
+    float *in_L, float *in_R,
+    float *out_L, float *out_R,
+    ulong count)
+{
+	double  in_L2[BLOCK_SIZE],  in_R2[BLOCK_SIZE];
+	double out_L2[BLOCK_SIZE], out_R2[BLOCK_SIZE];
+
+	for (ulong pos = 0; pos < count; pos += BLOCK_SIZE) {
+		ulong rem = BLOCK_SIZE;
+		if (pos + BLOCK_SIZE > count)
+			rem = count - pos;
+
+		for (ulong i = 0; i < rem; i++)
+			in_L2[i] = in_L[i];
+		for (ulong i = 0; i < rem; i++)
+			in_R2[i] = in_R[i];
+
+		process_double(data, in_L2, in_R2, out_L2, out_R2, rem);
+
+		for (ulong i = 0; i < rem; i++)
+			out_L[i] = out_L2[i];
+		for (ulong i = 0; i < rem; i++)
+			out_R[i] = out_R2[i];
+
+		in_L += BLOCK_SIZE;
+		in_R += BLOCK_SIZE;
+		out_L += BLOCK_SIZE;
+		out_R += BLOCK_SIZE;
+	}
+}