diff --git a/src/lang.zig b/src/lang.zig
index 7b6ec82..882cac9 100644
--- a/src/lang.zig
+++ b/src/lang.zig
@@ -233,13 +233,17 @@ pub const Lang = struct {
         return null;
     }
 
-    fn expectSingle(self: *Lang, args: ArgList) !void {
-        if (args.len != 1) {
-            std.debug.warn("expected 1 argument, found {}\n", args.len);
+    fn expectAny(self: *Lang, count: usize, args: ArgList) !void {
+        if (args.len != count) {
+            std.debug.warn("expected {} arguments, found {}\n", count, args.len);
             return error.ArgRequired;
         }
     }
 
+    fn expectSingle(self: *Lang, args: ArgList) !void {
+        return try self.expectAny(1, args);
+    }
+
     fn expectFloat(self: *Lang, count: usize, args: ArgList) !void {
         var i: usize = 0;
 
@@ -263,6 +267,21 @@ pub const Lang = struct {
             .Quicksave, .Noop => {},
             .Load, .RunQS => try self.expectSingle(cmd.args),
             .Amp => try self.expectFloat(3, cmd.args),
+            .RFlanger => try self.expectFloat(4, cmd.args),
+            .Eq => try self.expectFloat(5, cmd.args),
+            .Phaser => try self.expectFloat(6, cmd.args),
+            .Mbeq => try self.expectFloat(15, cmd.args),
+            .Chorus => try self.expectFloat(8, cmd.args),
+            .PitchScaler => try self.expectFloat(3, cmd.args),
+            .Reverb => try self.expectFloat(12, cmd.args),
+            .Highpass => try self.expectFloat(5, cmd.args),
+            .Delay => try self.expectFloat(12, cmd.args),
+            .Vinyl => try self.expectFloat(7, cmd.args),
+            .RevDelay => try self.expectFloat(5, cmd.args),
+            .Noise => try self.expectFloat(4, cmd.args),
+            .WildNoise => try self.expectFloat(4, cmd.args),
+            .Write => try self.expectFloat(3, cmd.args),
+            .Rotate => try self.expectAny(2, cmd.args),
             else => std.debug.warn("WARN unchecked command {}\n", cmd.command),
         }
     }