diff --git a/frontend/package.json.md5 b/frontend/package.json.md5
index fef5c03..1b05967 100755
--- a/frontend/package.json.md5
+++ b/frontend/package.json.md5
@@ -1 +1 @@
-c44a339d910658f51f3335fc3acef6bf
\ No newline at end of file
+320e1f1ff03eab1e1f33df45866c8ecf
\ No newline at end of file
diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index abead10..2bfdfba 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -101,6 +101,8 @@ function App() {
           {/* <HydraView /> */}
           <Toolbar />
           <Editor />
+          {/* horizontal line */}
+          <div className="border-t border-gray-300" />
           <Docs />
         </div>
       </div>
diff --git a/frontend/src/components/Docs/index.jsx b/frontend/src/components/Docs/index.jsx
index 2b068be..cfc9f8b 100644
--- a/frontend/src/components/Docs/index.jsx
+++ b/frontend/src/components/Docs/index.jsx
@@ -138,7 +138,7 @@ export default () => {
 
   return (
     // outer div has fixed height, inner divs scroll
-    <div className="p-4 h-full overflow-hidden">
+    <div className="pb-4 mx-2 h-full overflow-hidden mb-2">
       <h1 className="text-2xl">Documentation</h1>
       <div className="flex overflow-hidden h-full">
         {/* each child scrolls separately */}
diff --git a/pkg/mrat/script.go b/pkg/mrat/script.go
index 4452ddc..03fa5b6 100644
--- a/pkg/mrat/script.go
+++ b/pkg/mrat/script.go
@@ -1,6 +1,7 @@
 package mrat
 
 import (
+	"encoding/json"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -55,6 +56,35 @@ type (
 	}
 )
 
+// MarshalJSON implements the json.Marshaler interface for the Symbol type.
+func (s Symbol) MarshalJSON() ([]byte, error) {
+	m := map[string]any{
+		"name":  s.Name,
+		"group": s.Group,
+		"doc":   s.Doc,
+	}
+	if len(s.Arglists) > 0 {
+		arglists := make([]string, len(s.Arglists))
+		for i, a := range s.Arglists {
+			arglists[i] = fmt.Sprint(a)
+		}
+		m["arglists"] = arglists
+	}
+	if len(s.UGenArgs) > 0 {
+		ugenargs := make([]map[string]any, len(s.UGenArgs))
+		for i, a := range s.UGenArgs {
+			ugenargs[i] = map[string]any{
+				"name":    a.Name,
+				"default": fmt.Sprint(a.Default),
+				"doc":     a.Doc,
+			}
+		}
+		m["ugenargs"] = ugenargs
+	}
+
+	return json.Marshal(m)
+}
+
 func (cw *consoleWriter) Write(p []byte) (n int, err error) {
 	// write each line to the console
 	for _, char := range p {
diff --git a/pkg/stdlib/mrat/core.glj b/pkg/stdlib/mrat/core.glj
index 55eed1a..9fbd32a 100644
--- a/pkg/stdlib/mrat/core.glj
+++ b/pkg/stdlib/mrat/core.glj
@@ -734,12 +734,12 @@
 (def envelope env)
 
 (defn env-asr
-  [gate [a s r]]
-  (env gate [0 s 0] [a r] :release-node 1))
+  [gate [a s r] & {:keys [curve]}]
+  (env gate [0 s 0] [a r] :release-node 1 :curve (or curve :lin)))
 
 (defn env-adsr
-  [gate [a d s r]]
-  (env gate [0 1 s 0] [a d r] :release-node 2))
+  [gate [a d s r] & {:keys [curve]}]
+  (env gate [0 1 s 0] [a d r] :release-node 2 :curve (or curve :lin)))
 
 (defn env-perc
   [gate [a d] & {:keys [curve]}]
@@ -1268,6 +1268,12 @@
                    (mapv #(if (> %1 %2) 1 0)
                          tbl (rest tbl)))))))
 
+(defugen impulse-pattern
+  [impulse 1 "The impulse signal to trigger the pattern."
+   ^:noexpand pattern (euclid 3 8) "The pattern to trigger on the impulse signal."]
+  (let [pat-seq (step impulse pattern)]
+    (* impulse pat-seq)))
+
 (docgroup "Patterns")
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;