add draft declarations for custom commands

src/lang.zig

@@ -113,6 +113,13 @@ pub const Command = struct {
             .saturator => Saturator,
             .vintagedelay => Vintagedelay,
 
+            .noise => Noise,
+            .wildnoise => Wildnoise,
+            .write => Write,
+            .embed => Embed,
+
+            .rotate => Rotate,
+
             else => @panic("TODO"),
         };
     }
@@ -146,8 +153,37 @@ pub const Command = struct {
 
     pub const RunQS = struct {
         pub const base_tag = Tag.runqs;
-        program: []const u8,
         base: Command,
+        program: []const u8,
+    };
+
+    pub const Noise = CustomCommand(Tag.noise, custom.RandomNoise, struct {
+        seed: f32,
+        fill_bytes: f32,
+    });
+
+    pub const Wildnoise = CustomCommand(Tag.wildnoise, custom.WildNoise, struct {
+        seed: f32,
+        fill_bytes: f32,
+    });
+
+    pub const Write = CustomCommand(Tag.write, custom.Write, struct {
+        data: f32,
+    });
+
+    pub const Embed = struct {
+        pub const base_tag = Tag.embed;
+        base: Command,
+        split: usize,
+        index: usize,
+        path: []const u8,
+    };
+
+    pub const Rotate = struct {
+        pub const base_tag = Tag.rotate;
+        base: Command,
+        deg: usize,
+        bgfill: []const u8,
     };
 
     pub const Amp = LV2Command(